In the last和In the past的事态

人世沧桑,与我何干,我只在茫茫众生中掠过而已.天道如此,以我微薄之力,又能做得了什么.或许在这苍凉之中,我只能如此寂寞的走下去……

百度上

这个应该比较好理解的呀.这个是过去的过去的意思.asked已经是过去了,“write"还要在asked之前,就是过去的过去.

根据题意关键词

一般现在时.

这就要看你作文中写的是什么时间了,如是今天之前,就用一般过去式,如果是今天,就用一般现在时.事态错了肯定会扣分.

I always play at home I am running I got up at 6o'clock I will go to school tomorrow I had already been there He have gone He was playing piano yesterday

一波未平一波又息
龙困浅滩遭虾戏,虎落平阳被犬欺
屋漏偏逢连夜雨,船迟又遇打头风

现在进行时3种变形方法
1.直接加ing 例piaying、parking、doing
2.双写加ing 例swimming
3.去e加ing 例living
一般过去式
（1）一般情况下,动词词尾加 -ed
（2）以不发音的 -e 结尾动词,动词词尾加 -d
（3）以辅音字母 + y结尾的动词,把-y变为-i 再加-ed
例句A:What did you do last weekend?
B:I played football.
A:Did you read books?
B:Yes,I did.
一般现在时
一般现在时.表示通常性、规律性、习惯性的状态或者动作（有时间规律发生的事件）的一种时间状态.（很拗口,但是要学会就必须深刻体会）
口诀
当主语是第三人称单数时
肯定句 主语+动词三单+其他
否定句 主语+doesn't+动词原形+其他
一般疑问句 Does+主语+动词原形+其他
肯定回答 Yes,主语+does
否定回答 No,主语+doesn't
特殊疑问句 特殊疑问词+一般疑问句
当主语不是第三人称单数时
肯定句 主语+动词原形+其他
否定句 主语+don't+动词原形+其他
一般疑问句 Do+主语+动词原形+其他
用错结构全句都错,一定要注意.
例题
1.Did you go to the beach last weekend?Yes.We by sea.
2.She was at home yeaterday.
3.Listen!Who's (哭)in the next door?
4.My mother (感觉)ill yesterday,I took her to see the doctor.
5.How did you (度过)your vacatian?
6.I (写)a new song last weekend.
7.She (see) an interesting talk show yesterday evening.
8.My parents (stay)at hone last night.
9.She always practices (play) the guitar after school.
10.Look!The children are (play)happily.
11.Last weekend I (留下)at home.
12.I to the mountian yesterday.
13.Where (be) you yesterday morning?

现在进行时态的代表性词now,listen,look.
肯定句 :主语+be+动词的现在分词
一般疑问句 :把be动词提前
特殊疑问句：
对地点提问用特殊疑问词Where
对人称提问用特殊疑问词Who
对动作提问用特殊疑问词What,句中动词用doing 代替
exanple:
肯定句:I am wacthing TV ai home.
一般疑问句:Are you wacthing TV at home?
特殊疑问句：
对主语“I”提问：Who are wacthing TV at home?
对动作"wacthing"提问：What are you dong at home?
对地点“at home"提问：Where are you wacthing TV?
这都是我自己总结的

千钧一发 迫在眉睫 危在旦夕 十万火急 急于星火
四面楚歌 救火扬沸 一触即发 朝不虑夕 岌岌可危 火烧眉毛 十万火急 危如累卵 命悬一线 燕巢幕上 朝不保夕

if引导,主句将来时,从句一般现在时
while主句和从句时态一致
when和while都可以做“当……时”讲,区别就是：while时态一致,when时态可以一致也可以不一致,如：
Mary was reading a book when i came in.
Mary read a book while i came in.

时态和语态.时态有8种：一般现在、一般过去、一般将来、现在进 行、过去进行、现在完成、过去完成、现在完成进行、过去将来等.
差不多就这几种吧
语态：主动和被动

这是神学家和科学家们的问题.

是文中的么
可能上下文需要 现在时态说过去时态的第二天
就比如说 我去美国的第二天 天气又阴又冷

首先要知道的是时态只看理论或只看例子是远不够的,要多做题目,培养语感,这样凭语感就可使用出正确的时态.
现在完成时用法解析
1.构成
现在完成时是由助动词 have(has)+动词的过去分词构成.助动词说明该谓语是属于现在时范围.它和主语的人称、数要保持一致.过去分词是主要的谓语动词,说明句子的意义.
2.用法
（1）表示动作发生在过去某个不确定的时间,但对现在留下了某种影响和结果.常被just、already、yet 等副词修饰.如：
-Have you had lunch yet?-Yes,I have.I've just had it.
你（已经）吃午饭了吗?我刚刚吃过.（现在我不饿了）
（2）表示从过去某一时刻开始一直持续到现在的动作或状态.这个动作可能刚停止,可能仍然在进行.常带有for和since等表示一段时间的状语.如：He has taught here since 1981
他自1981年就在这儿教书.（可能还要继续教）
I have't seen her for four years.
我有四年没见到她了.
（3）表示说话前发生过一次或多次的动作,现在成为一种经验,一般译为汉语“过”,常带有twice,ever,never,three times等时间状语.
如：I have been to Beijing twice.我去过北京二次.
5.几点注意事项
（1）have been(to)与have gone( to)的区别：have been(to)表示“去过某地（现在已经回来了）”,可用于各人称；have gone(to)表示“去某地了（说话时某人不在当地）”,常用于第三人称,前者可与once ,never,several times等连用,后者则不能.如：They have been to Beijing twice.他们去过北京两次.
He has gone to Beijing .他去北京了.
（2）如单纯表示一段时间,或强调一段时间,虽有since一词,也不必用完成时.如：It is two years since his father died.=His father has been dead for two years.他父亲去世已有三年了.
（3）终止性动词现在完成时的否定式,已变成一种可以延续的状态,因此可以和表示一段时间的状语连用.
如：I haven't left here since 1997.自从1997年以来,我一直没有离开过这儿.

shall一般用于第一人称i、we,will则可用于各种人称,当使用第一人称是,shall和will可互换.
你问的那个问题,shall would have有一种假设的语气在里面,这是虚拟语气中的一种,要注意和will have区别

Summer day,we come to Qingdao,went to the underwater world.
We had just entered a specimen area,and I see a the giant sperm whale bone.The tour guide said:"the underwater world has two world most,a is the world's biggest and most complete bone,and a sperm whale,the world's largest aquarium,there are one thousand DuoZhong different fish.We look ahead,the most compelling to a few shrimp and crabs.You will say:" they have what special?Yes,here is a crab even though the body is not big,but his six legs have two or three meters long!Shrimp was the biggest glass and as thick,and the youngest the about the size and the ant.
Then,we come to the world of the sea,the door entrance on had a shark has been open eyes closed and with one eye,like say again:"welcome you!" Walk into it,on both sides of the road in aquarium keeps free fish and turtles.We'll see another world most.The aquarium is very high,cylindrical,from the first floor has been with to the second floor.The inside of the fish are various.Then,I went into the sea,I like the the up and down or so are all glass.Flocks of fish swim to this for a while,swim to that for a while.I have a feeling of the mirror in the body.They like to swim in the past is from my side.Father pushed me I just wake up from dream.And then I see sea serpents,it in the groin inserted in the sand,carrying the head,in what looks like is.And the dragon was swimming in it.No wonder they call the dragon,sea snakes!
And finally,we come to the museum,the inside of the jellyfish jellyfish have white,red,blue,and they like a stretch toward an umbrella shrinks,the most beautiful.
The classmates,do you think this beauty?

情 态 动 词 的 时 态
英语中情态动词也象行为动词一样,具有时态的变化.现根据情态动词的功能分述如下：
一、“能力”表示现在或将来的“能力”用can + 动词原形；表示过去的“能力”用could + 动词原形：
A computer can’t think for itself , it must be told what to do .
Can you join us tomorrow?
He could speak five languages when he was young .
表示将来的“能力”时用shall / will be able to 更能把时间关系表示明确.
二、“允许”表示现在或将来的“许可”,陈述句中用 can / may（不用could / might ）+动词原形,疑问句中用can /could / may / might +动词原形；表示过去的“许可”用could / might + 动词原形：
Could / Might / Can / May / I borrow your umbrella?
You may / can watch TV after you finish your homework .
He said I could go with him .
三、“禁止”表示现在的“禁止”用can't / mustn't / may not + 动词原形；表示过去的“禁止”用couldn't / mustn't +动词原形：
The guard said we mustn't / couldn't crossthe border.
You mustn't / can't / may not pick any flowers in the garden .
四、“必须”表示现在或将来的“必须”用must + 动词原形；表示过去的“必须”用had to / must +动词原形：
We must go early tomorrow .
Must we do it now?
She told me that she must / had to warn me of the danger .
五、“可能”表示现在或将来可能用can / could /may / might have + 过去分词；表示可能正在进行用can / could / may / might be + 现在分词：
He may / might / could leave tomorrow .
Might / Could / Can this be true?
He may not / mightn't /can't /couldn't have been at home last night .
They can't be working in the fields.
情态动词表示“可能”时,can 一般不用于肯定句,may 一般不用于疑问句,may not / mightn’t 表示“可能不”,can’t 表示“不可能”.
六、“肯定”表示现在肯定用must + 动词原形；表示过去肯定用must have + 过去分词；表示肯定正在进行用must be + 现在分词：
Jan’s light is on .She must be at home .
It must have rained last night ,for the ground is wet .
They must be reading in the reading room .
must 表示“肯定”时不能用于否定句,也不能表示将来.指将来肯定用be sure to :
He is sure to come tomorrow.
七、“必要”和“不必”表示现在或将来“必要（不必）”用need(n’t ) + 动词原形；表示过去用need (n’t )have + 过去分词；表示正在进行用need ( n’t ) be + 现在分词：
Need I clean the room today ?
Need you have told him about my plans ? 你把我的计划告诉了他有这个必要吗?
You needn’t have gone there . 你本不必去那儿的.
need 一般不用于肯定句need(n’t ) have + 过去分词与didn’t need + 不定式含义有所不同,前者表示某事过去没有必要做但却做了,后者表示某事不必要做（不论是否做了）.试比较：
A : I’ve brought my recorder.
B : But I’ve already got one .
A : Oh , so I needn’t have brought it .
A : I started off to walk , but Peter gave me a lift .
B : Oh , so you didn’t need to walk after all .
八、“（不）应该”表示现在或将来（不）应该做某事用should(n't ) / ought ( n't ) to + 动词原形；表示过去本该或不该做了某事用should (n't) / ought (n't ) to + have +过去分词；表示应该或不该正在做某事用should ( n' t ) / ought (n't ) to + have + 过去分词：
You ought to / should have helped him yesterday.
We should / ought to help each other .
He shouldn't / oughtn't to have cheated in the exam .
This is what I should / ought to be doing .
九、“（不）敢”表示现在“（不）敢”用dare + 动词原形；表示过去“（不）敢”用dare (d) + 动词原形,或dare have + 过去分词：
Dare you do it ?
I daren't ask you because I thought I must be wrong .
I didn't like their new house , though I daren't have said so .
dare 作为情态动词一般不用于肯定句.
十、“习惯”表示现在的习惯用will + 动词原形；表示过去的习惯用would / used to + 动词原形：
He used to / would get up at five when he lived with us .
In fine weather he will often sit in the sun for hours .

用will不好.用would或者一般现在时更恰当
my face would turn red ...
my face turns red ...

你去死 自己写111111111111111

中文里有“已经”,“还”,“直到现在”等词的时候,可以酌情考虑要用完成时态.

日新月异 沧桑陵谷 白云苍狗 事过境迁 斗转星移 人走茶凉 沧桑陵谷 世态炎凉 变化无常 瞬息万变 物是人非 时过境迁 昨日黄花

因为现在时的用法还可以表示在说话之后即将有的或者必定有的事情.

Travel in Lijiang
I heard Lijiang is a very beautiful city when I was young.I travel there in a holidy with my parents.I went there plane.I saw there were many moutain when I got out the plane.The air was fresh.We went to the Lijiang Gucehng the fist day,we bought some intresting things and had a good meal in the Lijiang Gucheng.The second day ,we went to the Yulong snow moutain,it's beautiful,and it's my first time see the snow.I played with the snow happily.My father told me that Yulong snow moutain is a famous place in China,many people came here every year.I was happy in this trip,even like there better than Beijing!

目前我们了解的情况就这么多,我们会一直关注事态的发展
That's what we have known,we'll pay attention to its development

（1+10%）X+（1+5%）Y=（1+8%）Z （1）式
（1+15%）X+（1+10%）Y=Z+13 （2）式
X+Y=Z （3）式
（2）式 减 （1）式 得到 5%X+5%Y=13-8%Z （4）式 5%(X+Y)=13-8%Z （5）式
（3）式联合（5）式,得很 5%Z=13-8%Z 得 13%Z=13 Z=100万
可能讲抽象了,加油!

条件句：过去式,should do,were to do这三种形式都可.
主句：would do.

被动语态 结构：am/is/are/was/were + done（动词过去分词）
这里的 am/is/are/was/were 即 be 动词的不同时态的形式,be 是系动词,你可以把它看做动词
你说的什么情态动词与被动语态无关,当被动语态前有情态动词时,由于情态动词后必须加动词原形,所以你对被动语态理解有问题
建议：去买本英语语法参考书,好好研究一下被动语态

have been 和had been 的最大区别就是动作虽都发生在过去,但动作的结果影响是现在还是过去,影响到现在（说话当前这时）就用现在完成时,如果影响到的是过去（如说话时是过去）则用过去完成时,过去完成时多用于条件假设从句和间接引语的宾语从句中.
时态：
1.have learnt （动作学是过去的,但影响是说你现在可以自行修改错误了,所以用现在完成时）
2.has been （说话是当时现在,现在完成时）
单项：
3.had put 选 C 用完成时是强调动作有先有后,两个动作都发生在过去,如在过去的过去前发生的动作就用过去完成时,先戴上帽子,后出去
4.Has your father returned from Africa yet?你爸爸从非洲回来了吗?
Yes,but he________here for only three days before his company sent him to Australia.是的,已经回来了.但是他只在这里停留三天时间,他公司又派他去了澳大利亚.
A.was B.has been C.will be D.would be
可以看到,爸爸又被公司派出去了（过去派出去的）,在这里停留是在派出去之前发生的,应该用过去完成时,但选项中没有,所以就不要分动作先后,不用完成时,用一般过去时,表明过去时间内发生的一种状态,也是可以的,选A
改错
5.It is the second time this happened.
happened -> has happened 这种句型（就是.已经第几次了,什么事要用完成时）,前面是it is ,说明强调的是到现在的影响,用现在完成时
6.While the train was still moving,a great many men had suddenly jumped out.
had suddently jumped out -> suddently jumped out,因为前面一个动作the train moving火车仍在移动,后面的动作大量人突然跳出去,两个动作没有先后,是同时发生的,否则前面也不要用进行时,所以用一般过去时即可
7.I haven't eaten anything after breakfast.
haven't eaten -> didn't eat 或 don't eat
理由同上句,两个动作的先后顺序反了,先吃完早饭,再没有任何进食,后面的动作反而用了完成时是不对的,如果针对说过去我就没有再进食用一般过去时,如果说的是现在的情况用后者一般现在时

接一般现在时好一点吧,随着时间的流逝,如何如何如何
当然接将来时语法上也没错的.
比如I believe that as time goes by,our relationship will become closer and closer.

现在完成事态have has（been） done sth从过去一直到现在的
过去完成时had（been） done sth发生在过去的过去的,谓语动词为过去式,二者可通过画时间轴来辨别

I have a happy family .There are three people in my family.They are my father,my mother and me.My father's name is Dave .He is a doctor .His favorite color is blue.He always reads newspapers in the moring.My mother's names is Linda.She is a teacher.Her favorite color is white.She often do housework in the afternoon.I'm Mark.I'm a studant.I like grey very much.I have too much homework every day.So,i usually do my homework at night.This is my family.I love my family.中文; 我有一个快乐的家,有三个成员在我的家里.他们是我的爸爸,我的妈妈和我.我的爸爸叫戴维,他是一个医生他最喜欢的颜色是蓝色他常常在早上看报纸.我的妈妈叫做琳达.她是一个老师.她最喜欢白色.他常常在下午做家务.我叫马克.我很喜欢灰色.我每天有很多的作业,所以我常常在深夜写作业.这就是我的家,我爱我的家.

和谐
和谐：在事态发展中的一种相对均衡、统一、协调的状态.是让人与群体、阶层、集团、事务、自然界、科学界之间的关系处于融洽、协调、无根本利害冲突,使人与人之间的关系处于相互尊重、信任、帮助,使人与自然和谐相处并良性互动的状态.

will +v原型
这就是一般将来时,用于未发生的事情,因为只是“一般”,因而使用will+v原型,也就是动词原型.
will+doing
没有will doing这个用法的
一般将来时后面跟的是do
或者用will be doing
i will do something是指我有这个意愿,打算但奏不奏效是以后的事,也是未必的.一般你没有太多一定的把握的话就用这个吧
i will be doing something说明自己已很肯定的相信到时自己会正进行这些事,所以说是很肯定,有决心,并带有种许诺的意味,听到得的人可以带有期待啊
will+have 动词ed
完成时 表示已经完成,包括过去完成时“had + done”,一般现在完成时“has/have + done”,将来完成时“will + have + done”.
回答完毕,

不相同!前一个密切是形容词,是褒义的.后一个做定语用,带有一定的动态性!

1.Jim went to the mountains yesterday.
2.What did sandy do last weekend?
3.I had dumplings for lunch last friday.
4.Did you do your homework last night?
5.She wrote a new song last month.
答案准确,

一波三折
晴天霹雳

did'nt是助动词,它的作用只限于know,how引导的宾语从句不在其限定范围内

this year 不表示特定时态,出现在句中要联系语境进行分析

1
英语的八大时态：
1
．一般现在时基本结构：
一般现在时除主语是第三人称单数时谓语动词要加
s
外,一律用动词原形.
例：
I go to school at 6 every morning.
Summer follows spring.
2.
一般过去时基本结构：
一般过去时用动词的过去式构成,
即在动词原形后加
ed
.
例：
He was here just now.
What did you do yesterday?
We often played together when we were children.
3.
现在进行时基本结构：
现在进行时由
am/is/are
加现在分词构成.
例：
They
’
re having a meeting.
I
’
m studying at an evening school.
4.
过去进行时基本结构
过去进行时由
was/were
加现在分词构成.
例：
What were you doing this time yesterday?
During the summer of 1999 she was travelling in Europe.
5
．一般将来时基本结构
由
will
加动词原形构成,当主语是第一人称时,也可以
用
shall
加动词原形.
例：
Telephone me this evening.I
’
ll be at home.
2
I
’
ll (shall/will) do a better job next time.
6.
过去将来时基本结构
过去将来时由
would,
was/were
going
to,
was/were
to
was/were
about
to
等加动词原形构成
,
也可由
was/were
on
the point of
加动名词构成.
例：
I knew you would agree.
I said I would arrange everything.
7.
现在完成时基本结构：
由
have
加动词的过去分词构成,主语是第三人称单数
时,要将
have
改为
has
.
例：
I have seen the film already.
我已经看过那部电影了.
(
现在我知道电影的内容了.
)
Have
you
seen
my
bag?
你看到我的手提包了吗
(
你
知道它在哪里
8.
过去完成时基本结构
由
had
加动词的过去分词构成.
例：
She said she had never been to Paris.
她说她从未去过巴
黎.
When the police arrived,the thieves had run away.
警察
到达时,小偷们早就跑了.

We also observed consistent results between population-based studies and hospital-based studies in our analysis,.However, we still believed that controls in population-based studies are more representative than controls from hospital-based studies. What the factors might contribute to the discrepancy are environmental factors and genetic backgrounds.

However,these studies focus on the relationship of the LEPR Lys656Asn or Ser343Ser genetic polymorphism with cancer susceptibility,leading to controversial conclusions.
The disagreement among these studys' conclusions reflects the shortcomings of these studies

在写学术论文的局限性时,我指的是第一句,最好用一般现在时.以下是我的修改：
There are a few limitations in our meta-analysis. First, the sample size of the study might not be large enough to avoid the problem of increasing the probability of false positive or false negative. Similarly, the subgroup analyses contained small numbers which made it difficult for us to draw any specific conclusions from the study.

当主句动词表达“主观的建议、劝告、命令”等意义时,从句谓语用虚拟语气,无论主句时态如何,无论从句主语如何,从句动词只可能是原形,或should+原形.又比如：
The teacher ordered that he go home early.

一般后面是用过去时.不过也看具体语境.

有的,就是dared

没错,就像你刚刚说的那道选择题一样
if it rains this afternoon

1.what concerns us is we are not prepared for the change of the state of affairs
2.the mother was concerned about her children's safety,because they didn't come home after school at the usual time.
3.all those who concerned themselves with this matter regretted it