高三复习之it用法归纳

高三复习之it用法归纳

（一）. it用作代词

1. 代替前面提到的事物或事件。

“Where is the dog?”----It’s in the bedroom.

I am sending you some advice. It might help you.

He was late again. It made the teacher angry.

2. 指人。it指性别不明的婴儿或身份不确定的某人。如：

“Who is that?”----“It is me.”

There is a knock on the door.----It must be the postman.

3. 代替this, that或某些不定代词something, anything, nothing等。如：

What’s this?----It’s a new machine.

Nothing is wrong, is it?

4. it 作非人称代词的用法，主要用于指时间、日期、距离、天气、地点及温度等。如：

It is sunny today. It is Friday today.

It’s 6 miles to the nearest hospital.It is very warm in the house. （二）. it用作形式主语

当不定式、动名词、从句等作句子主语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语it。如：

1. It + be + adj + for (of) sb to do sth

of 用于指某人的性格、属性、特征等，介词for表示对象，意为“对……来说”

It is hard for him to make up his mind.

It is foolish of her to say such a thing.

2. It is no good \ no use\ useless\ a waste of time + doing sth 做什么是没有用的\浪费时间

In my opinion, it’s no use arguing with him.

3. It +be + adj +主语从句…

形容词有：obvious\ clear\amazing\ certain\ possible\true等。形容词是:important\strange

\necessary\essential等，主语从句中谓语动词用虚拟语气：(should )+ do

It is obvious that your painting is better than mine.

It is necessary that we (should ) drink 500ml water every day.

4. It +be + n +主语从句\to do…这是。。。

名词有：a pity\a shame\ a fact\ an honor\ no wonder\ one’ duty…

It is a pity that he failed in the driving test again.

5. It is + v-ed+主语从句…据说\报道\认为\建议。。。

动词过去分词有：said\ reported\ thought\ believed\ known\ announced\expected\acknowledged…注意①：It is suggested\recommended\ordered\commanded\required…that+( should) do

It is strongly recommended that effective measures should be taken to ban smoking.

It is widely acknowledged that …. 这是公认的。。。

②句型的转换：It is said that Bell invented the telephone.

Bell is said to have invented the telephone.

Linda is said to be interviewing the famous star now.

6. It is likely that… = Sb be likely to do\have done\to be doing 。。。是可能的。

It is likely that the MH370 plane will be found one day.

The MH370 plane is likely to be found one day.

7. It struck\hit\occurred to sb that…某人突然想起。。。

It occurred to me that he had an important conference to attend the next morning

8. It looks \seems\appears\ happens + that \ as if+从句… 这看似好像。。。

It seemed as though he didn’t recognize me.

9. It turns out/turned out that…结果是。。。证明是。。。

It turned out that he was right.

10. It doesn’t\ didn’t make any difference \ made no difference (to sb) +主语从句…

。。。对某人来说（没）有影响、意义、作用、区别

It makes no difference to me whether you will come or not.

11. It doesn’t make sense to sb +主语从句…某人不懂\不明白。。。

It made no sense to me what you said.

（三）. it用作形式宾语

当不定式、动名词、从句等作宾语且其后跟有宾语补足语时，通常会在宾语补足语前使用形式宾语，而将真正的宾语移至句末。其基本结构为“动词+it+宾语补足语+不定式(动名词或从句)”。如：

1.sb think\ believe\find\consider\feel\make…+ it + adj\n + to do \ doing\ that从句

During his lecture, the scientist found it easy to explain the theory to the students.

He makes it a rule that some gifts are given to his family after business.

2.I would appreciate \ enjoy\ love\ like\ dislike \ hate it if you …

I would appreciate it if you would like to teach me how to use the computer.

I hate it when somebody speaks with mouthful.

3. make it clear that…弄清楚

4.depend on it that…相信，指望。。。

5.see to it that…确保，一定注意到

6.take it for granted that…认为。。。是理所当然的

7.owe it to sb that…把。。。归功于某人

（四）. It 构成的关于时间的特殊句型

1. It is the first\second\last… time that sb + have\has done 某人第几次干某事

It was the first\second\last… time that sb + had done

It is the first time that I have seen a 3D film.

2. It’s (about / high) time + that sb + should do\ did 某人该做某事了

It is high time that we should take \ took some measures to protect our earth.

3. It was\ will be + 时间段+ before…过了多久才。。。

It wasn’t\ won’t\+ 时间段+ before…没过多久就。。。

It didn’t \ won’t take long before…没过多久就。。。

注意before 的翻译：It was two years before they met each other again.

4. It takes\ took sb + 时间段+ to do sth. 某人做某事花了。。。时间。

It takes years to master a new language.

5. It is \has been + 时间段+ since+一般过去时自从。。。有多长时间了。

It is\ has been two years since he graduated from school.

6. It is\ was + 具体时间点+ when…当。。。的时候是。。。

I still remember it was two years ago when I first worked as a volunteer.