用it作形式主语改写1、you are so kind to tell me the truth.2、you are s

一般不省略

If i study very hard, then i'll be able to get a good result in the exam.
It's the book that i was looking for in this shop.

It's said that our school is going to hold an art festival next week.
Someone is knocking at the door.Who can it be?(事实上,这里是用it做主语.这个句子不可能用形式主语或形式宾语表达.)

The first day to practice,it is important to wear the right thing .

It is wrong

能常用to do.具体构式大体两种：1、 It 's +adj/n +for sb. to do sth.
2、It's +adj/n +of sb. to do sth.

翻译 他比以前多花费了两倍的价格 it 不是形式主语 是代词 指代一个东西 what引导宾语从句

he have his further study incollege.(当主语从句在后面时,连词that可以2）if引导的宾语从句不能作介词的宾语,而只有用whether引导才行.这一点

It is strange that such a rich man lives so simple.

可以啊.比如 It‘s important to keep healthy.
It就是作to keep healthy的形式主语.

It's hard to eat three hamburgers at one time.

是的,It is true whether you believe it or not.
I don't care if you are serious or not.
名词性从句有,主语,宾语,同位语,表语,介词宾语从句等.

it cost me 600 dollars to buy this compute

变成肯定句,it is necessary to.这是一中句型,译为做ao.是重要的,必要的,简单的,I t is +形容词+to do sth

it做形式主语的句子中逻辑主语可以为不定式和主语从句.it用法灵活：
以It is extremely obvious that she is right.为例.亦可以写成：She is right is extremely obvious.二句话语法名称不同,实则同一句话.

您的问题很简单.百度知道很高兴帮助您解决您提出的问题.
原句：只是渴望成功而不努力是没有用的
翻译：
It is no use what （或者that） just eager to succeed without working hard
百度知道永远给您最专业的英语翻译.

it作形式主语,真正的主语或者宾语可以是三种形式,to do（不定式）、doing（动名词）和主语从句,其中前两种形式也可是包含逻辑主语的复合结构
1、接不定式,it is +adj+ to do 复合结构为it is +adj+ for/of sb + to do.其中,属于性格特征描述的adj用of sb,如 It is so kind of you to invite me It is easy to finish the work
2、接动名词的结构常常为,It is no use/ no good/ a waste of time （for sb） doing sth.括号中为复合结构
3、主语从句,这就涉及你说的（should）do形式,正确的结构是 It is + adj + (for/of sb) + that 从句.此处that 从句为真正的主语,此从句中的谓语部分用（should）do形式.实际上这是一种虚拟语气的用法.

下列动词或词组后面都可以接doing:
admit 承认
appreciate 感激
avoid 避免
complete完成
consider认为
delay 耽误
deny 否认
detest 讨厌
endure 忍受
enjoy 喜欢
escape 逃脱
fancy 想象
finish 完成
imagine 想象
mind 介意
miss 想念
postpone推迟
practice 训练
recall 回忆
resent 讨厌
resume 继续
resist 抵抗
risk 冒险
suggest 建议
face 面对
include 包括
stand 忍受
understand 理解
forgive 宽恕
keep 继续
例如：Would you mind turning down your radio a little, please? 你把收音机音量调小一点,好吗
The squirrel was lucky that it just missed being caught. 这松鼠幸运得很,刚逃避了被逮住的厄运.
admit to
prefer…to
be used to
lead to
devote oneself to
object to
stick to
no good
no use
be fond of
look forward to
be proud of
be busy
can't help
be tired of
be capable of
be afraid of
think of
burst out
keep on
insist on
count on
set about
put off
be good at
take up
give up
be successful in
下列动词或词组都可以用不定式：
afford
aim
agree
arrange
ask
decide
bother
care
choose
demand
desire
determine
elect
endeavor
hope
fail
help
learn
long 渴望
mean
manage
offer
plan
pretend
refuse
tend
undertake
expect
hate
intend
例如：
The driver failed to see the other car in time. 司机没能及时看见另一辆车.
He offered to help me. 他表示愿意帮助我.
需要省略to的不定式的情况有：
1） 情态动词 （ 除ought 外） 后.
2） 使役动词 let, have, make后,感官动词 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后.
注意：被动语态中不能省去to.例如：
I saw him dance. 我看见他跳舞.
=He was seen to dance.
The boss made them work the whole night. 老板让他们整夜干活.
=They were made to work the whole night.
3） would rather,had better句型后
4） Why… / why no…句型后
5） help 后可带to,也可不带to, help sb （to） do sth：
6） but和except后.but前是实义动词do时,后面出现的不定式不带to.
比较：He wants to do nothing but go out. 他只想出去玩.
He wants to believe anything but to take the medicine. 除了吃这药,他什么都信.
7） 由and, or和than连接的两个不定式,第二个to 可以省去：
8） 通常在discover, imagine, suppose, think等词后作宾补时,可以省去to be.例如：
He is supposed （to be） nice. 他应该是个好人.
一些重要的区分：
1) stop doing/to do
stop to do 停止,中断做某事后去做另一件事,stop doing 停止做某事.例如：
They stop to smoke a cigarette. 他们停下来,抽了根烟.
I must stop smoking. 我必须戒烟了.
2)forget doing/to do
forget to do 忘记要去做某事,forget doing 忘记做过某事.例如：
The light in the office is stil on. He forgot to turn it off. 办公室的灯还在亮着,他忘记关了.（没有做关灯的动作）
He forgot turning the light off. 他忘记他已经关了灯了.（已做过关灯的动作）
3)remember doing/to do
remember to do 记得去做某事,remember doing 记得做过某事.例如：
Remember to go to the post office after school. 记着放学后去趟邮局.
Don't you remember seeing the man before? 你不记得以前见过那个人吗?
4)regret doing/to do
regret to do 对将要做的事遗憾,regret doing 对做过的事遗憾、后悔.例如：
I regret to have to do this, but I have no choice. 我很遗憾必须这样去做,我实在没有办法.
I don't regret telling her what I thought. 我不为告诉她我的想法而后悔.
5)cease doing/to do
cease to do 长时间,甚至永远停做某事,cease doing 短时停止做某事,以后还会接着做.例如：
That department has ceased to exist forever. 那个系已不复存在.
The girls ceased chatting for a moment when their teacher passed by. 姑娘们在老师走过时,停了会聊天
6)try doing/to do
try to do 努力,企图做某事,try doing 试验,试着做某事.例如：
You must try to be more careful. 你可要多加小心.
I tried gardening but didn't succeed. 我试着种果木花卉,但未成功.
7)go on doing/to do
go on to do 做了一件事后,接着做另一件事,go on doing 继续做原来做的事.例如：
After he had finished his maths,he went on to do his physics. 做完数学后,他接着去做物理.
Go on doing the other exercise after you have finished this one. 作完这个练习后,接着做其他的练习
8)be afraid doing/to do
be afraid to do 不敢,胆怯去做某事,是主观上的原因不去做,意为"怕",be afraid of doing 担心出现doing的状况、结果.doing 是客观上造成的,意为"生怕,恐怕".例如：
She was afraid to step further in grass because she was afraid of being bitten by a snake.
她生怕被蛇咬着,不敢在草丛中再走一步.
She was afraid to wake her husband. 她不敢去叫醒她丈夫.
She was afraid of waking her husband. 她生怕吵醒她丈夫.
9)be interested doing/to do
interested to do 对做某事感兴趣,想了解某事,interested in doing 对某种想法感兴趣,doing 通常为想法.例如：
I shall be interested to know what happens. 我很想知道发生了什么事.（想了解）
I'm interested in working in Switzerland. Do you have any idea about that?
我对在瑞士工作感兴趣.你想过这事吗? （一种想法）
10) mean to doing/to do
mean to do 打算、想,mean doing 意味着.例如：
I mean to go, but my father would not allow me to. 我想去,但是我父亲不肯让我去.
To raise wage means increasing purchasing power. 增加工资意味着增加购买力.
11)begin（start） doing/to do
begin / start to do sth /begin / start doing sth.
a） 谈及一项长期活动或开始一种习惯时,使用doing.例如：
How old were you when you first started playing the piano? 你几岁时开始弹钢琴?
b） begin, start用进行时时,后面动词用不定式to do.例如：
I was beginning to get angry.我开始生起气来.
c） 在attempt, intend, begin, start 后接know, understand, realize这类动词时,常用不定式to do.例如：
I begin to understand the truth.我开始明白真相.
d） 事物作主语时.例如：
The snow began to melt.雪开始融化了
12)感官动词 + doing/to do
感官动词 see, watch, observe, notice, look at, hear, listen to, smell, taste, feel + do表示动作的完整性,+doing 表示动作的进行性.例如：
I saw him work in the garden yesterday. 昨天我看见他在花园里干活了.（强调"我看见了"这个事实）
I saw him working in the garden yesterday.（强调"我见他正干活"这个动作）昨天我见他正在花园里干活.would to do sth
want to do sth
like doing sth
enjoy doing sth
有很多,楼上是一些固定搭配还有一个例子:
go on to do(doing)都是继续做某事但有区别
go on to do是结束一件事继续做别的事
go on doing是继续做同一件事
enjoy,suggest,practice,consider,finish,spend后面接doing sth.
另外,forget doing sth 指忘记做过某事
forget to do sth 指忘记去做某事
stop doing sth 指停止做某事
stop to do sth 指停止下来,去做另一件事

It is too sensible for you to make such a decision

It is so wise that you made such a decision.

1.I think it's more comfortable to go to there by boat.2.I think it is possible to solve this problem in another way.3.I want to ask somebody to have my tape recorder repaired.4.He is listening to others telling stories.5.I have never seen this word used in such way.6.It's very difficult for him to talk with you.