时间状语从句含义就是下定义

时间状语从句：
I will return the book when I finish it.when 引导的一个句子指明主句谓语动词return的发生时间,作状语.
定语从句：
I will never forget the time(day,month,year...) when we played together.when引导的句子对前面提到的时间像time,day ,month等进行解释说明,像这句,哪个time?我们一起玩的那些时间.
区分办法：定语从句前面肯定有先行词,就是你那个从句要解释说明的,如果一个when引导的句子前面有time,day,month之类表时间的词,那肯定就是定语从句了,相反如果when从句前面不是时间类的词那就肯定不是定从啦.
where引导的同理,如果前面有表地点,地方的先行词,那就是定从,没有就是状从
例：
This is the place where I put the book.where前面有place,定从.
I can't find the building where my brother works.定从.
Please put the drugs(药品) where children can't reach.前面的drugs不能表地点或地方,状从.
其实这样讲也不严密,但是是最简单最快的,要想最好的掌握,就要充分理解什么是定语什么是状语,理解了就一切OK了.虽然没分但看你名字挺可爱,so打了这么多字.祝你好好学习天天向上~88

when引导的时间状语从句一般用一般过去时或过去进行时
began用来说明音乐会开始了 主句也用一般过去式
when I arrived at the station 是一般过去时
那时他们正在等我 所以用过去进行时
由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时；如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导

after 和before 引导时间状语从句时具体用法
before 所引导的时间状语从句 所表示的动作 发生在主句动作之后 如果强调主句的动作发生在前 主句谓语 要用过去完成时 before 引导的从句用一般过去时 如不强调动作的先后 主句和从句 均用一般过去时
如 she worked in shsnghai before she came here.
...

可以的
例如
When Tom had finished this job ,he left the house.

1什么是时间状语从句啊?

时间状语从句是由含时间的状语从句组成.
（Link Words:after,as,as soon as,before,each time,every time,once,since,the first time,the moment,until,when,while,etc.）
例句：1)We lowered our voice AS SOON AS we entered the library.
2)THE FIRST TIME I saw a woman opening the door foe a man,I was very surprised.
2.修改病文：请挑出病句或词语,并加以改正.
A：Hello!Is that B speaking?
B：Hello!This is B speaking.
A:Oh!B,I want you to pass a message to C:C borrows(borrowed) my jacket and didn't(haven't) return it.I want to konw why C didn't(haven't) return it and where it is.
B:Well,please wait a minute.
B:C,A said that you borrowed his jacket and didn't(haven't) return it .He want(wants) to know why you didn'(haven't)return it and where it is.He want(wants) you to give his (him)an answer .
C:Oh!we were supposed to meet at the bus stop this morning (and I wanted )to return it.but A didn't come to the bus stop.
B:A ,C said that you were supposed to meet at the bus stop this morning (and he wanted)to return it.but you didn't come to the bus stop.
A:Oh,I forget it !Please tell him:Please take my jacket to school tomorrow. Bye!
B:Bye!
B:C,A want me to tell you that please take his jacket to school tomorrow.
C:Oh!I see.

你说的4种情况分别如下：
1.Once you are in America,you will know how developed the country is.
Once in America,you will know how developed the country is.
2.Once you climb onto the top of the mountain,you will overlook the whole city.
Once climbing onto the top of the mountian,you will overlook the whole city.
3.Once you have understood the rule,you will obey it.
Having understood the rule,you will obey it.
4.Once you can speak English,you will feel very happy.
不能省.

when与连续性的或短暂性的动词连用,从句的动作与主句的动作有可能是同时发生,也可能是从句的动作发生在前,在表示两个动作同时发生时,可与WHILE互换.例如；when we were leaving,it began to rain,when引导的从句动词是leave,发生在rain之前.
While译为“在……同时”,“在…期间”,谓语动词要加延续性动词.例句：please be quiet while i ’m talking to you,.从句中是进行时时态时,一般都用while)
注;when 和while都可做并列连词,此时when表示”就在此时”,while可以译为然而,但是,表转折,强调.例句:he is good at basketball,while his brother is dood at football.While we __________ (wait) for the bus, a girl __________ (run) up to us.
2. I __________ (telephone) a friend when Bob __________ (come) in.
3. Jim __________ (jump) on the bus as it __________ (move) away.
4. We __________ (test) the new machine when the electricity __________ (go) off.
5. She __________ (not want) to stay in bed while the others ________ (all, work) in the fields.
6. While mother ________ (put) Cathy to bed, the door bell ________ (ring).
7. As I __________ (walk) in the park, it __________ (begin) to rain.
8. Even when she ___________ (be) a child she _____ _____ (already, think) ofbecoming a ballerina (芭蕾舞演员).
9. It was quite late at night. George __________ (read) and Amy __________ (ply) her needle when they __________ (hear) a knock at the door.
10. There __________ (be) a group round the fire when they __________ (reach) it. An old woman __________ (sit) on the ground near the kettle; two small children __________ (lie) near her; a donkey __________ (bend) his head over a tall girl.
1. I _____ (have) my breakfast at half past six yesterday morning.
2. Mary _____ (go) over her lessons from six to seven last night. John and peter ____(do) the same thing.
3. What _____ you ___ (do) at that time? We _____ (watch) TV.
4. Was your father at home yesterday evening? Yes ,he was. He _____ (listen) to the radio.
5. They _____(not make) a model ship when I saw him.
6. _____ they ____ (have) a meeting at 4 yesterday afternoon?
No, they _____. They _____ (clean) the classroom.
7. ______ it ______(rain) when you left school?Yes, it ____. (No, it ____)
8. What _____ your father _____ (do) when he was your age?
9. One day, Edison _____ (wait) for a train to arrive, and suddenly a little boy ran to the track(轨道) to play.
10. He asked me if I ______ (go) fishing that afternoon.
11. The three of them were in a hurry because their plane _____ (leave) in five minutes.
12. In a letter, john told us that he _____ (come) to china next month.
13. When the bell rang, jenny _____ (wait) in her seat.
14. She _____ (make) her dress the whole afternoon.
15. While my father ____ (look) through the evening paper, he suddenly ____ a cry.
三、 选择题。
1.I ______ cooked a meal when you _____ me.
a. cooked, were ringing b. was cooking, rang
c. was cooking, were ringingd. cooked, rang
2.He said he _____ to draw a plane on the blackboard at that time.
a. triesb. tried c. was tryingd. will try
3.While she ______ TV, she ______ a sound outside the room.
a. was watching, was hearingb. watched, was hearing
c. watched, heard d. was watching, heard
4.They _____ a football game from 7 to 9 last night.
a. were watching b. watch c. watchedd. are watching
5.What book ____ you ______ when I ____ you at four yesterday afternoon?
a. did, read, was seeingb. did, read, saw
c. were, reading, sawd. were, reading, was seeing
6.It was Friday evening. Mr and Mrs. Green _____ ready to fly to England.
a. are gettingb. getc. were gettingd. got
7.Lei Feng _____ always _____ of others when he ______ in the army.
a. is, thinking, wasb. was, thinking, isc. did, think, isd. was, thinking, was
8.A girl ______ my pen fall off the table when she _____ me.
a. saw, passedb. was seeing, passed c. was seeing, passedd. was seeing, was passing
9.We ____ for tom at ten last Sunday. He often kept us ______.
a. were waiting, waitingb. were waiting, wait c. waited, waiting d. waited, wait
10. He ____ his father on the farm the whole afternoon last Saturday.
a. helpsb. would help c. was helpingd. is helping
11. While mother _______ some washing, I _____ a kite for Kate.
a. did, made b. was doing, made c. was doing, was makingd. did, was making
12. “_______ you angry then?” “they ______ too much noise.”
a. are, were makingb. were, were makingc. are, maded. were, made
13. He ____ some cooking at that time, so _____ me
a. did, heard b. did, didn’t hearc. was doing, heardd. was doing, didn’t hear
14. This time yesterday jack _____ his bike. He _____ TV
a. repaired, didn’t watch b. was repairing, watchedc. repaired, watched d. was repairing, wasn’t watching
15. His parents wanted to know how he _____ on with his new classmates.
a. was getting b. gets c. is getting d. will get
四、 翻译。
1．昨天这个时候你们英语老师在做什么？她在和一些家长谈话吗？
2．当我离开的时候他正在画一幅世界地图。
3．当你看见他们的时候他们在干什么？他们在打扫教室。
4．那时二班的学生没在操场上踢足球，他们在打篮球。
5．一天，母亲下班回家的时候，约翰在写给一个朋友写信。
6．上周五一下午，学生们在干什么？他们一直在往墙上贴海报。
7．昨天这个时候，一些学生在植树,一些学生在给小树浇水。
8．老师走进教室的时候，学术们正在谈论当天的新闻。
9．老虎等猴子的时候，他听到一个声音。
10.今天上午放学的时候在下雨吗？是的，天正下着大雨。

时间状语从句连接词：when,while,as,before,after,as soon as,till,until,not…until,the first/second…/last time,the moment,the minute,the instant,immediately,directly,instantly,hardly…when,scarcely…when,no sooner…than
条件状语从句连接词：if,unless,now (that),as(so) long as,in case,on condition that,suppose/supposing,provided/providing

when 时点,时段,
while 时段
as 强调从句和主句中的谓语动词同步进行.
请及时采纳,不懂继续问( 天天在线 ）

其实as，when，whlie都差不多

while和when都是表示同时，到底句子中是用when还是while主要看从句和主句中所使用的动词是短暂性动作（瞬时动词）还是持续性动作。 1、若主句表示的是一个短暂性的动作，而从句表示的是一个持续性动作时，两者都可用。如： He fell asleep when he was reading. 他看书时睡着了。 I met him when I was taking a walk in the park. 我在公园散步时遇到了他。 2、若主、从句表示两个同时进行的持续性动作，且强调主句表示的动作延续到从句所指的整个时间，通常要用 while。如： Don’t talk while you’re eating. 吃饭时不要说话。 I kept silent while he was writing. 在他写的时候，我默不作声。 3、若从句是一个短暂性动作，而主句是一个持续性动作，可以 when 但不用 while。如： When he came in, I was listening to the radio. 他进来时，我在听收音机。 It was raining hard when we arrived. 我们到达时正下着大雨。 4、若主、从句表示的是两个同时(或几乎同时)发生的短暂性动作，一般要用 when。如： I thought of it just when you opened your mouth. 就在你要说的时候，我也想到了。 至于什么是短暂性动作，什么是持续性动作，其实有个很简单的规律。就是如果是进行时态，一般是持续性的。如果是过去式，一般是短暂性动作。 对于，填写when还是while的问题，通常首先看主句和从句中的时态，再根据以上4个规律来判断填写那个单词。

是的.此外,when还可以做定语从句的关系副词,此时,它就不是引导时间状语从句了.

1）用as引导时间状语从句时,一般表示两个动作同时进行,可以翻译成“一边...,一边...”. B
2 .谓语动词用单三形式，表示复数含义

when 作“当……时”解时,引导的就是时间状语从句

一般过去时间状语：ago,last,the next,the following,yesterday,one day,once,(与dinosaur有关的用过去）…
一般将来时间状语：in+短时间,next,this weekend,tomorrow,in future,after…
主将从现：
在以when,after,as soon as等引导的时间状语从句以及以if,unless等引导的条件状语从句中,如果主句是一般将来时,从句则用一般现在时.
主过从过：
在含有宾语从句的主从复合句中,当主句的谓语动词为过去时态时,从句须用表示过去的某种时态.
主现从任：
在宾语从句中,当主句的时态为一般现在时、现在进行时、现在完成时等时态时,后面从句时态不受主句限制,可根据情况,选用各种适合的时态.
注意 1.当宾语从句表述的是客观事实、科学真理、现在的习惯动作以及格言等时,其时态不受主句限制,而用一般现在时.2.在"since＋点时间"句型中,主句通常用现在完成时,从句用一般过去时.3.在复合句中,如果主、从句表示的动作或状态都发生在过去,而且有先后,则在先的用过去完成时,在后的用一般过去时.
（来自：一半课上老师整理的,一半网上搜的,整理如上）希望对你有帮助!

是的，还引导条件状语从句。

可以
Lily had written some letters before she went out shopping
用来表示时间先后的

as引导时间状语从句时,从句中的动词用延续性的或非延续性的,都可以
一、从句动作和主句动作同时发生,且从句动作为延续性动词时
① As we were dancing,a stranger came in．（dance为延续性动词）
当我们跳舞时,一位陌生人走了进来.
②As she was making a phonecall,I was writing a letter．（make为延续性动词）
当她在打电话时,我正在写信.
二、当主句、从句动作同时进行,从句动作的时间概念淡化,而主要表示主句动作发生的背景或条件时,只能用 as.这时,as常表示“随着……”；“一边……,一边……”之意.
1） As the time went on,the weather got worse．（as表示“随着……”之意）
2） As years go by,China is getting stronger and richer．
随着时间一年一年过去,中国变得越来越富强了.
3）The little girls sang as they went．小姑娘们一边走,一边唱.
这时go就是非延续性.
在第二种情况下,as 表达的事件,往往只是主句动作发生的背景或条件时,as 只是一个次要的时间说明,不像while 从句有强调 while 动作本身的意思.
例句中的go基本都不是真正“走”的意思,想最后一个例句,其实用went 不如用walked合适.不过go on,go by 的词组中,go确实都是非延续性的动词,只是在词组中,可以理解成一个延续的动作.
但是在第一种情况下,表示两个动作的同时进行,所以一定要用延续性动词.
所以,as引导的时间状语从句不是不可以用非延续性的动词,不过在这种情况下,非延续性动词往往是以一个词组的形式出现,并且表示的是一个延续的时间概念.

可以参考《结束蹦单词时代：外教教你用连词》，中国书籍出版社，第171-172页：
1. While I do the housework, you clean the car.
2. You hold up the picture while I nail it into the wall.
3. While he watched TV, I cooked the dinn...

三句口诀：“主现从任、主过从过、主将从现.”
意思是说：
主句是现在时的话,从句随便你用什么时态.
比如：I‘ll tell her the good news when she comes back.
Don’t laugh at me when I make a mistake.(祈使句)
You should be quiet when you are in the library.(含情态动词)
主句是过去式的话,从句用四种过去时态中的一种（过去一般、过去进行、过去完成、过去将来）
比如：When he entered the room,I stopped eating.
When he entered the room,I was eating.
When he entered the room,I had been eating for five minuted.
When he entered the room,I would have finished eating.这个不太恰当,但你能理解就行.
主句是将来时的话,从句用现在时.
I will be a nurse when I grow up.

另外,since 引导时间状语从句时,其主句通常要用现在完成时,有时也用现在完成进行时.如：
She has had another baby since I saw her last.从上次我见到她以来,她又生了一个孩子.
He has grown an inch since I saw him.我上次见到他以后他已长高了一英寸.
注：当主句为“It + be + 一段时间”时,则通常用一般现在时代替现在完成时.如：
It’s more than three years now since I saw her last.我们已有三年多没见面了.

一些特定句式的时态：
由no sooner...than,hardly [scarcely]…when引出的时间状语从句,其主句通常用过去完成时,从句通常用一般过去时.如：
Hardly had he arrived when she started complaining.他刚到她就抱怨起来.
No sooner had he gone to sleep than the telephone rang.他刚睡着电话铃就响了.
We had no sooner set out than a thunderstorm broke.我们刚出发就下起一阵雷暴.
No sooner had she agreed to marry him than she started to have terrible doubts.她刚同意嫁给他她就开始产生可怕的疑虑.
When you have finished your homework,I will give you 10 dollars.做完作业,我给你十美元作为奖励.
When he has come back,I have finished my homework.你到家的时候,我肯定已经完成家庭作业了.

不懂问我,南无地藏菩萨!

until一般地说,用来作time up to 解,当我们谈到目前正在进行而将来某一时刻将停止的事情或情况时,用until,before用来变将来某一时刻表会发生或在此以前会发生的动作.而且与UNTIL主句的动词一定不是短暂性的动词,是可以有延续性的动词,比如come,go,open等是不会和UNTIL用在一起的.

引导时间状语从句的五类引导词
引导时间状语从句的从属连词(以下称引导词)很多,为方便记忆,现作以下分类：
1.基本类
包括before,after,when,while,as,since,till,until,once,as soon as 等.如：
Did anyone call when I was out?我不在家时谁来过电话吗?
We have known each other since we were children.我们从小认识.
You’ll feel better after you take the pills.吃完药丸后你会感到好一些.
Make sure that all the lights are off before you go to bed.睡觉前一定要关灯.
Don’t promise him anything till we’ve had time to think about it.在我们有时间考虑之前别答应他什么.
2.名词类
即由名词词组充当引导词,包括the moment,the minute,the second,the instant 等(均表示“一……就……”.如
I loved you the instant (that) I saw you.我一见到你就爱上你了.
Tell me the moment (that) you get the results.你一拿到结果就给我打电话.
3.副词类
即由副词充当引导词,如 immediately,directly,instantly等.如：
I came immediately you called.你一打电话我就来了.
Directly I walked in the door I smelt smoke.我一进门就闻到烟味.
4.短语类
主是几个涉及time短语,如every time,each time,(the) next time,any time,the last time,the first time 等.如：
Next time you come in,please close the door.下次你进来,请关门.
My roof leaks every time it rains.每次下雨,我的房顶就漏.
He felt nervous each time she spoke to him.每次她和他讲话,他都感到紧张.
The last time we talked he said he needed another two days.上次我们谈话时他说他还需要两天.
5.句型类
包括no sooner…than,hardly…when 等.如：
I had no sooner closed the door than somebody knocked.我刚把门关上就有人敲门.
Hardly were the words uttered when he began to regret them.话刚说出口他就开始后悔了.

一般条件下,连接词都不能够省略的.除非是定语从句里面that、which有时候可以省略.
when一般不会牵扯到这个问题.
或者你想要问什么问题,但是没让我太听明白.你可以把你经常会混淆的句子拿来,我帮你具体分析一下.

这句话需要这样拆分：he wrote his name [two years after he was born],括号里面的是时间状语.
相当于he wrote his name [when he was two years old].
他两岁时会写自己的名字了.

我是这么来分析理解的
1）、你把句子分成主句和从句,然后先看看主句里头主、谓、宾全不全
如果主句差宾语,那when引导的就是宾语从句
比如：I have to decide when I should go.主句里面decide没有宾语,决定什么呢,所以这里when引导的就是宾语从句了
（当然,如果主句是系表结构,动词是系动词的话,那when引导的就应该是表语从句,比如：The question is when I should go.）
如果主句差主语,那引导的就是主语从句,比如：When I should go is a question.主句里面is是谓语,没有主语,什么是问题呢,所以when引导的就是主语从句啦.
2）、如果主句的主谓宾都有,那就又要分情况了,而我以前快速判断的方法是判断when引导的从句和主句里的宾语是什么关系
如果when引导的这个从句是用来修饰主句里的宾语的,也就是说它在主句里充当的是一个定语的成分,那它就是个定语从句
比如：I will never forget the day when I left her.这个句子里主句的宾语是那一天,而那一天是哪一天呢,就是从句里我离开她的那一天,when引导的这个从句是用来修饰主句里的宾语的,所以这里when引导的是一个定语从句,一般来说呢,when引导的定语从句,先行词都是the day,the moment之类表示时间的词
如果when引导的从句不是用来修饰主句里的宾语的,那它就是个状语从句,当然状语从句也分时间状语从句,条件状语从句,原因状语从句和让步状语从句,这个我一般是按照意思来分辨的
如果可以翻译成当……的时候,一……就,就在这时,每当,或者当……之后,那引导的就是时间状语从句
如果可以翻译成如果……就,那就是条件状语从句
如果可以翻译成既然,那么,那就是原因状语从句
如果可以翻译成尽管,虽然,那就是让步状语从句
主要应该就这么多了吧,

when 和 while 都可以引导时间状语从句,在一部分情况下二者可以互换,一部分情况下不可以.下面我们来分析一下,注意while 后面的从句一般都是可以持续的动作或者状态.
一.最常见的考题出现在用when和while 引导表示过去的时间状语从句的情况中时态的搭配.具体情况如下:
(一) 如果when 后面的动词是一个持续性的动词那么多数情况下,when　引导的从句用过去进行时,表示过去的具体时间（该动作持续发生的期间）,或者when 从句中的动词为be动词等,持续的状态的词,则从句用一般过去时表示过去的具体时间(该状态存在的时间),根据我们讲过的一般过去时的定义（发生在过去的某个具体时间的动作或者状态）,主句多用一般过去时；这种情况下,while 和when 可以互换
Grandma fell asleep when he was reading.奶奶在他看书的时候睡着了 The light went out while we were chatting.在我们聊天的时候,灯灭了.When she was a little girl,she liked sweets very much.还是个小姑娘的时候她非常喜欢吃糖.
(二)如果when从句中的动词是瞬间动词,则从句用一般过去时表示过去的一个时间点,那么根据时态的定义,主句用过去进行时(在过去的某个时间点上正在持续的动作),或者过去完成时(过去的某个时间点之前完成的动作对这个时间点的影响,或者持续到这个时间点),这时候从句不能用while 引导
They were having dinner when I got home.我到家的时候他们正在吃饭 The wind was blowing hard when I went out this afternoon.今天下午我出去的时候风很大
注意:这种结构可用来表示从句的动作发生的很突然,很意外,when 的用法类似于suddenly He was crossing the street when he was knocked down by a running car.The last man in the world was sitting in his room when there came a knock at the door.
二.while 可以表示两件含义上相反或者相对的事情同时发生,或者形成对照的含义,这时候只能用while不能用when,例如:
He was cooking while his wife was watchting TV.他在做饭,而他太太在看电视 Tom save money while Jack spends every penny he earns.Tom存钱,而Jack 花掉挣来的每一分钱三.
While除了引导时间状语从句外,还可以引导条件状语,表示as long as,只要...的含义,或者是引导让步状语,表示although.尽管...的含义等等,这些时候都只能用while 不能用
when We will keep our promise while he keeps his.只要他遵守诺言,我们就会遵守我们的诺言
She married the young man while her parents were stongly against it.尽管她父母强烈反对,她还是嫁给了那个年轻人

一般现在时

When asked when the teacher's motives, he remained silent.

可以
两个动作在同时发生，持续时间长的用过去进行，时间短的用一般过去时。如：
I was reading a book when she came in.
I met my friend when I was having a walk.
如两者动作均持续较长，用while连接，表对比。如
Mum was cooking while Dad was reading a newspaper.
祝你新春快乐！天天进步！

when 从句用的最多的是一般过去时,而主句的时态没有限制,根据具体情况而定.
(e.g.) Sorry,I was out when you called me.
一般情况下,when 引导时间状语从句的话,从句发生的事件,相当于另一个主句发生的时间点.从句的重点是把它作为一个时间点,所以when 多数情况下用的是一般过去时,则不用正在进行时.when引导时间状语从句,从句也可以有其它的时态,不过也只是作为一个时间参照点,比如过去完成时.基本上没有进行时的句子.
(e.g.) When I got to the airport,the guests had left.
注意把when引导的宾语从句和时间状语从句分开,就看能不能调位置了
(e.g.) I don’t know when he will come tomorrow.
相比于when 来说,while 引导时间状语从句的话,侧重点就不一样了.当while 事件正在发生的时候,另一件事如何如何.所以,一般用的是正在进行时.而另一件事的状态没有硬性的要求,根据具体情况而定.例如：
(e.g.) While we were talking ,the bell rang.
(e.g.) You can’t do your homework while you’re watching TV.
while 表示的是一段时间,是一个过程.如果时间提示词有“一段时间”的含义的时候,选择while.而且while的谓语动词必须是延续性动词,不能是瞬时动词.
as 从句正在发生,主句也正在进行当中.as 从句多数为一般过去时.也可以翻译成咱们常说的“一边……一边……”
(e.g.) The students took notes as they listened．
as 表达的事件,往往只是主句动作发生的背景或条件时,翻译成“随着……”
(e.g.) As the time went on,the weather got worse.随着时间的推移,气候更加糟糕.
如果强调动作正在发生,as 从句也可以用正在进行时.
(e.g.) As we was going out,it began to snow.
应试永远是应试,没有那么多语法可言,如果不想做个哑巴英语,最好是多有机会联系一下,你说错了词,用错了时态,多数情况下对方可以明白的.慢慢练习就好了,如果身边没有机会,就多看看中英文字幕对应的美剧,然后把中文字幕去了,等你看英文字幕,速度已经可以跟上语速的时候,再把英文字幕去了,既可以联系听力又可以联系口语,慢慢来吧

immediately
as soon as
hardly..when
scarely..when
no soon..than
the instant
instantly
directly
the moment
高中常用

表示时间的状语从句可以由when, whenever, as, while, before, after, until, till, since, ever since, now (that), once, so/as long as, as soon as…引起.
　I will give you the information as soon as I get it.
　Once you start to smoke, it is hard to give it up.
　Let's stay here until the teacher comes.
　有时也可以用every time, each time, immediately, the moment, soon after, shortly after, next time等词引起状语从句.
　Every time I see him, I have a terrible feeling inside.
　None of them stopped talking the moment she came in.
　I will show you the movie the next time you come here.
　Shortly after Abraham Lincoln took office, the southern States rebelled.
　主句动词是持续,用肯定句（直到……为止）.主句动词是瞬间动词,用否定形式.（直到……才）
when, while 和 as 引导时间状语从句的用法
　　这三个词的意思很简单,都有“当……时候”的意思.但学生经常会问三个词的区别在哪儿,特别是在做选择题的时候.别说是学生,就我个人而言,做这样的选择题要保证百分之百的正确也是不可能的.现根据大量的实例和个人的思考,做一点小结,供大家参考.
一、when 的用法
　　如果只从现象来看,when 从句用的最多的是一般过去时,而主句的时态没有限制,根据具体情况而定.
　　1. When he was a child he was always trying out new ideas.
　　　 他小时候就常常试验一些新的设想.
　　2. When she came into my room, I was just reading a book. 她走进我房间时,我正在看书.
　　3. Were you writing when the teacher came in? 老师进来的时候,你在写信吗?
　　4. Sorry, I was out when you called me. 对不起,你打电话来的时候我出去了.
　　5. He was on the point of leaving when someone knocked at the door.
　　　 他正要走,这时有人敲门.
　　6. I thought of it just when you opened your mouth. 就在你要说话的时候,我也想到了.
　　7. I had hardly[scarcely] closed my eyes when someone knocked at the door.
　　　 我刚一闭上眼,就有人在敲门了.
　　根据以上的例句,我们可以总结出一点：when 从句的A事件,相当于另一个事件B发生的时间点.也就是说,when 从句的重点不在动作本身发生的状态,而只是把它作为一个时间点,所以when 多数情况下用的是一般过去时,则不用正在进行时.因为如果用正在进行时,它表示的就是一段时间而不是一个时间点了.根据这一点,有的文章补充说：when 从句的动词大多是瞬时动词.这种说法也可以参照.
　　实际上,when 从句也可以有其它的时态,但几乎也不用进行时,因为它也只是作为一个时间参照点.例如：
　　1. When I got to the airport, the guests had left. 当我赶到飞机场时,客人们已经离开了.
　　2. When he had finished his homework, he took a short rest.
　　　 当他完成作业后,他休息了一会儿.
　　3. Why do you want a new job when you have got such a good one already?
　　　 你已经找到如此好的工作,为何还想再找新的?
　　4. You shall borrow the book when I have finished reading it.
　　　 在我读完这本书后,你可以借阅.
　　5. When the manager comes here for a visit next week, I’ll talk with him about this.
　　　 下周,经理来这参观时,我会和他谈谈此事.
二、while 的用法
　　相比于when 来说,while 从句的侧重点就不一样了.while 从句的侧重点在于描述动作正在发生的状态,它的意思是：当while 事件正在发生的时候,另一件事如何如何.所以,while 从句一般用的是正在进行时.而另一件事的状态没有硬性的要求,根据具体情况而定.例如：
　　1. While my wife was reading the newspaper, I was watching TV.
　　　 当妻子正在看报纸的时候,我正在看电视.
　　2. While Jim was mending his bike, Lin Tao came to see him.
　　　 正当吉姆修自行车时,林涛来看他.
　　3. While they were talking, the bell rang. 正在他们谈话的时候,上课铃响了.
　　4. You can’t do your homework while you’re watching TV.
　　　 你不能一边看电视一边做家庭作业.
　　5. While John was sitting biting his nails, I was working out a plan to get us home.
　　　 约翰坐在那里咬指甲时,我正在制定一个回家的计划.
　　从时间的角度来看,while 表示的是一段时间,是一个过程.这是while 的侧重点.因此,如果含有“一段时间”的含义的时候,就可以用while.
　　6. Strike while the iron is hot. 趁热打铁.
　　这句话中,是说趁着铁是热的这段时间,赶紧打铁.如果换成 when 意思就变了,相当于说铁只热了一下,打一下,然后铁就冷了.这显然不符合文意.
　　再例：
　　—I'm going to the post office.
　　—While you're there, can you get me some stamps?
三、as 的用法
　　as 从句表示的也是一件事情正在发生,另一件事也正在进行当中.但与 while 从句不同的是,as 从句用的一般不用正在进行时,而只是一般过去时.as 从句一般可以翻译成“边……边……”.例如：
　　1. As my mother sang those old songs, tears ran down her cheeks.
　　　 当我妈妈唱起那些老歌时,眼泪顺着她的脸颊流了下来.
　　2. The students took notes as they listened. 学生们边听课边做笔记.
　　3. As we talked on, he got more and more excited. 我们继续往下谈的时候,他越来越兴奋.
　　4. The little girls sang as they went. 小姑娘们一边走,一边唱.
　　5. Just as he caught the ball, there was a tearing sound.
　　　 当他抓住球的时候,有一种撕裂的声音.
　　as 表达的事件,往往只是主句动作发生的背景或条件时,as 只是一个次要的时间说明,不像while 从句有强调 while 动作本身的意思.因此,as 常常翻译成“随着……”之意.
　　例如：
　　1. As the time went on,the weather got worse. 随着时间的推移,气候更加糟糕.
　　2. The atmosphere gets thinner and thinner as the height increases.
　　　 随着高度的增加,大气越来越稀薄.
　　3. As years go by,China is getting stronger and richer.
　　　 随着时间一年一年过去,中国变得越来越富强了.
　　少数情况下,如果强调动作正在发生,as 从句也可以用正在进行时.这只能算是特例了.
　　1. The sad mother sat on the roadside, shouting as she was crying.
　　　 伤心的妈妈坐在路边,边哭边叫喊.
　　2. As we were going out, it began to snow. 正当我们出门时,雪开始下起来.
　　3. He came in as I was going to bed. 我正要上床睡觉,他进来了.
四、when, while, as 的互换
　　如果从句动作和主句动作同时发生,并且从句动作为延续性动词时,when,while,as 可以互换使用.这种情况下,它们的细微区别恐怕连英、美人自己也说不清了.
　　1. When /While /As we were dancing, a stranger came in.
　　　 当我们跳舞时,一位陌生人走了进来. [dance 为延续性动词]
　　2. When /While /As she was making a phone call, I was writing a letter.
　　　 当她在打电话时,我正在写信. [make为延续性动词]
　　3. While/When/ As I was walking down the street, I noticed a police car in front of the
　　　 bank.
　　　 我顺着马路往前走时,发现银行门前停着一辆警车.
五、比较while, when, as
　　1）as, when 引导短暂性动作的动词.
　　　 例如：Just as / Just when / When I stopped my car, a man came up to me.
　　　 　　　我刹车后,有一个人向我走来.
　　2）当从句的动作发生于主句动作之前,只能用when 引导这个从句,不可用as 或 while.
　　　 例如：When you have finished your work, you may have a rest.
　　　 　　　干完活后,你可以休息一下.
　　3）从句表示“随时间推移”连词能用as,不用when 或while.
　　　 例如： As the day went on, the weather got worse.　日子一天天过去,天气越变越坏.
　　2）比较until和till
　　此两个连词意义相同.肯定形式表示的意思是“做某事直至某时”,动词必须是延续性的.否定形式表达的意思是“直至某时才做某事”.动词为延续性或非延续性都可以.正确使用这两个连词的关键之一就在于判断句中的动词该用肯定式还是否定式.
　　肯定句：I slept until midnight. 我一直睡到半夜时醒了.
　　　　　　Wait till I call you. 等着我叫你.
　　（在肯定句中可用before代替.例如：Let's get in the wheat before the sun sets.）
　　否定句：She didn't arrive until 6 o'clock. 她直到6点才到.
　　　　　　Don't get off the bus until it has stopped. 公共汽车停稳后再下车.
　　　　　　I didn't manage to do it until you had explained how. 直到你教我后,我才会做.
　　区别：1）until可用于句首,而till通常不用于句首.
　　例如：Until you told me, I had heard nothing of what happened.
　　　　　直到你告诉我以前,出了什么事我一点也不知道.
　　3）until when 疑问句中,until要放在句首.例如：
　 　　---Until when are you staying?　你呆到什么时候?
　 　　--- Until next Monday.　呆到下周一.　
　 　　注意：否定句可用另外两种句式表示.
　　4）Not until…在句首,主句用倒装.
　 　　例如：Not until the early years of the 19th century did man know what heat is.
　 　　　　　直到19 世纪初,人类才知道热为何物.
　 　　　　　Not until I began to work did I realize how much time I had wasted.
　 　　　　　直到工作,才认识到我已蹉跎了许多岁月.
　　5）It is not until… that….
　 　　例如：It was not until I began to work that I realized how much time I had wasted.
　　6）表示“一……就……”的结构
　 　　hardly/scarcely…when/before, no sooner…than　和as soon as都可以表示“一……就……”的
　 　　意思.
　 　　例如：
　 　　I had hardly / scarcely got home when it began to rain. 刚回家,就下起雨来了.
　 　　I had no sooner got home than it began to rain.
　 　　As soon as I got home, it began to rain.
　 　　注意：如果hardly, scarcely 或no sooner置于句首,句子必须用倒装结构.
　 　　例如：
　 　　Hardly / Scarcely had I got home when it began to rain.
　 　　No sooner had I got home than it began to rain.
whenever
adv.无论何时
conj.每当,无论何时,随时
I'd like to see you whenever it's convenient.
在你方便的时候我想来看看你.
Come whenever you like.
你什么时候想来就来.

after/before/when/while/as soon as/as/until...+一个陈述句,这样的就叫做时间状语从句.
时间状语从句表示一个时间,和其他时间不同在于,它是一个句子来表示时间.

*时间状语从句
引导时间状语从句的从属连词和词组有：
1）when,whenever,while,as,after,before,since,till,until,once等.
We have learnt quite a lot about it since we came here.
2)as soon as,hardly(scarcely)...when,no sooner...than,each(every) time,the moment,immediately(that)等.
As soon as I sent an e-mail message,I received positive responses.
The moment he heard the good news,he jumped with joy.

I 'll call you as soon as I get there. 我一到那里就给你打电话.

when除了用来引导主语从句、宾语从句、时间状语从句、表语从句和定语从句,可以为副词、连词、代词,根据不同用法而定.
下面是when的不同词性用法,差别还是挺大的,看下例句,就能感受出来.
语法没有为什么,就是这么用的,应用熟练就好了.
adv副词,conj连词 pron 代词
when:
(1) adv.什么时候,何时 at what time
[例句]
When can you come to see me?
你什么时候来看我?
(2) adv.是…时候at which;on which
[例句]
Please tell me when we'll have the meeting.
请告诉我我们什么时候开会.
(3) adv.在…的时候 at or during which
[例句]
How I regretted the days when I had played and should have studied!
我多么懊悔我本该好好学习却玩掉了的那么多的日子!
(4) adv.那时 but at that moment
[例句]
It happened on a day in November when the weather was very wet and cold.
这事发生在十一月的一天,那时天气又潮湿又寒冷.
We were about to start,when it began to rain.我们刚要出发时开始下雨了.
(5) conj.当…时 at the time when
[例句]
It happened when I was living in the country.事发生在我住在农村的时候.
It was raining when we arrived.我们到达时,天正下着雨.
(6) conj.一…就 immediately after
[例句]
When I had finished dinner I went to bed.
我吃完饭就睡觉了.
Let us set out when the sun has risen.太阳一出来,我们就动身.
(7) pron.（关系代词）那时
which time
[例句]
I came here in 1949,since when I have been engaged in this work.
我1949年到这里,从那时起我就担任这项工作.
We came a week ago,since when the weather has been bad.
我们在一星期前来此,从那时起天气就一直不好.
(8) pron.（疑问代词）什么时候
what time
[例句]
Since when have you been here?你从何时起在此地?
Until when can you stay?你能呆到什么时候?

　　时间状语从句　　时间状语从句是一个非常重要的语法项目,常见的用法主要有：　　1.由when, while, as引导的时间状语从句.　　When you think you know nothing, then you begin to know something.当你以为自己...

引导时间状语从句的连词和词组有：when,while,as（当……时）；as　soon　as,the　moment,the minute,immediately（一……就）；until,till（直到……）；before（在……以前）；after（在……以后）；since,ever　s...

时间状语从句是用when while引导的
条件状语从句是用if引导的

1 要,即：I was having dinner when Tom called me from UK yesterday evening.
2、They ( have been )to America three times
他们到过美国三次了.
祝你假期愉快!加油!不明白再问!

as soon as ,在时间状语从句中,主句用一般将来时,从句用一般现在时.
例如:I am going to watch TV as soon as I finish my homework.
由when引导的时间状语从句,1.主句用过去进行时,从句应用一般过去时；2.主句将来时,从句一般现在时（有时候也会用现在完成时）
while引导的时间状语从句,只要保证while后面从句的时态用进行时就可以了,主句用不用进行时无所谓.
as 常用于:
1 表书两个发展变化中的情况:
As you grow older,you'll know better and better about yourself.
2 表示"一边……一边……“：
They talked happily as they walked along the river.
3 表示随着短暂动作的发生,另一行为伴随发生：
My cap was blown away as I sat down
none是三者以上,表示否定,用于单数
as well as 是看前者,还有not only… but also…
例如:She as well as you is an English teacher
with是看后者

状语从句采用一般现在时态.

练习题
I .填入适当的引导词
1.I haven't heard from him _____ he went to America .
2.He won't be here _____ he is invited .
3.He will not go to the cinema _____ he is very busy .
4.We found the key _____ she lad left it .
5.We found the books two days ____ he had gone away .
6.We had no sooner got to the station _____ the train left .
7.He speaks English ______ he were an Englishman .
8.He is explaining clearly _______ they could understand .
9.Do not leave the room _____ you have finished the test .
10.She sang ______ she went along .
答案：1.since 2.unless 3.because 4.where 5.after 6.than 7.as if 8.so that 9.before 10.as
II.改错
1.The children were running on the playground as fast as they can .
2.Since her husband had died ,so she had to support her family .
3.He won't go out until his mother will come .
4.He was very foolish that he didn't pass such an easy exam .
5.Tom had gone out as soon as his mother got home .
6.It was three months since he came to our school .
7.The playground of our school is larger than their school .
8.The streets in Nanjing are wider than Shanghai .
9.Whatever there is plenty of sun and rain ,the fields are green .
10.She sings songs as if she is a bird .
答案：1.can 改为could 2.去掉so 3.will come改为 comes 4.very改为 so 5.as soon as 改为when 6.was 改为is 7.than 之后加上that of 8.than 后加 those in 9.whatever改为 wherever 10.is改为 were
III.找出从句并指出是那类从句
1.It depends on whether we have enough time .
2.The question he asked was where the electrical equipment should be stored .
3.The mountain is no longer what it used to be .
4.The fact that she works hard is well known to us all .
5.He was not the man that he was before .
6.Now you was free ,why not go swimming with us
7.Where there are schools and colleges ,there are examinations .
8.Bad habits ,once firmed ,are difficult to give up .
9.She often wears the same kind of skirt as her twin sister does .
10 .The moment he opened the window ,a bird flew in .
答案：
1.whether we have enough time 介词宾语从句
2.he asked 定语从句 where the electrical equipment should be stored表语从句
3.what it used to be 表语从句
4.that she works hard 同位语从句
5.that he was before 定语从句
6.Now you was free 让步状语从句 now= now that
7.Where there are schools and colleges 地点状语从句
8.once firmed 时间状语从句
9.as her twin sister does 定语从句
10.The moment he opened the window 时间状语从句
IV.填入适当的引导词完成句子
1.____ will do the experiment comes to the professor's office .
2.___ will do the experiment hasn't been decided .
3.The teacher didn't leave ______ twelve o'clock .
4.______ the day went on ,the weather got worse .
5._____ she is young ,she knows quite a lot .
6.It worried her a bit ____ her hair was turning grey .
7.You will be late ____ you leave immediately.
8.Go and get your coat .It's ______ you left it .
9.______ is mentioned above ,the number of the students in senior high schools is increasing .
10.____ had I entered the room ____ the phone rang .
答案：1.Whoever 2.Who 3.until 4.As 5.Although 6.that 7.unless 8.where 9.As 10 Hardly,when ( No sooner ,than )
V.改错
1.Is this the watch for which he is looking now
2.This is all which I can do for you .
3.Do you know the old man at the back of the room,whom has been chosen head of the factory .
4.I want to know the way which you learn new words .
5.Can you tell me that there's a bookstore near here
6.Our school quite different from that it was before .
7.If she likes the present is not clear to me .
8.For she is ill ,she hasn't come to school .
9.It gave him so a big shock that his face turned pale .
10.He is cleverer than any boy in his class .
答案：1.for 放在looking 之后 2.which 改为 that 3.whom 改为who 4.which改为 how 5.that改为 whether 6.that 改为what 7.If改为 Whether 8.For改为Because 9.so改为 such 10.any 后加othe

其实别人不是这样用的.
比如：It's 4'o cock,when the boss come in,...
Since,until,可以加详细时间
after,before,好像不是这样用的.

时间状语从句主要考察引导词的使用和主句从句的表达.
对于主句从句的表达方面的考查则是侧重于：如果表示的是将来发生的事情时,when、while、until、after、before、as soon as引导时间状语从句是用“一般现在时”表将来.主句用一般将来时.例如：
a.I will call you as soon as I arrive in Beijing.我到北京就将给你打电话.（这是由as soon as引导的时间状语从句,从句中的谓语动词arrive是一般现在时,表示一般将来时,绝不可用will arrive）.
b.If he comes back,please let me know.如果他回来了,请通知我.（从句中的谓语动词用comes back,表示一般将来时,绝不可用will come back）.
此外,如果句子不是表示将来,就会考察when,while的区别.
由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时；如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导,如：
a.When the teacher came in,we were talking.当老师进来的时候我们正在说话.
当此句改变主从句的位置时,则为：While we were talking,the teacher came in.当我们正在说话的时候老师进来了.
b.They were singing while we were dancing.我们在跳舞的时候他们正在唱歌.
希望对你有所帮助!

when引导的句子当然都是一般过去时.while引导的则是过去进行时

　　1）as,when 引导短暂性动作的动词.
　　Just as / Just when / When I stopped my car,a man came up to me.
　　2）当从句的动作发生于主句动作之前,只能用when 引导这个从句,不可用as 或 while.
　　When you have finished your work,you may have a rest.
　　3）从句表示"随时间推移"连词能用as,不用when 或while.
　　As the day went on,the weather got worse.
　　日子一天天过去,天气越变越坏.

直接引语在改为间接引语时、时态需要做相应的调整.
现在时它需改为过去时态；过去时态改为完成时；过去完成时则保留原来的时态.如：
1)She said."I have lost a pen."→She said she had lost a pen
2)She said."We hope so."→She said they hoped so.
3) She said."He will go to see his friend."→She said he would go to see his friend.
但要注意在以下几种情况下.在直接引语变为间接引语时,时态一般不变化.
①直接引语是客观真理.
"The earth moves around the sun and the moon moves around the earth,the teacher told me.→ The teacher told me the earth moves around the sun and the moon moves around the earth.
②直接引语是过去进行时,时态不变.如：
Jack said."John,where were you going when I met you in the street?"→Jack asked John where he was going when he met him in the street.
③直接引语中有具体的过去某年、某月、某日作状语,变为间接引语时,时态不变.如：
Xiao Wang said."I was born on April 2l,1980." →Xiao Wang said he was born on April 20,1980.
④直接引语如果是一般现在时.表示一种反复出现或习惯性的动作,变间接引语,时态不变.如：
He said,"I get up at six every morning." →He said he gets up at six every morning.
⑤如果直接引语中的情态动词没有过去时的形式（例：ought to,had better,used to)和已经是过去时的形式时,（例：could,should,would,might）不再变.如：
Peter said."You had better come have today." →Peter said I had better go there that day.
如何变状语：
直接引语变间接引语,状语变化有其内在规津,时间状语由“现在”改为“原来”（例：now变为then,yesterday.变为 the day before）地点状语,尤其表示方向性的,或用指示代词修饰的状语,由“此”改为“彼”（例：this 改为that),如：
He said,"These books are mine." →He said those books were his.