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It”用法及其句型和固定搭配讲解

“It”用法及其句型和固定搭配，是高中英语语法的重点、难点，因此应给予充分的重视，今天我们就为大家归纳一下it的用法归纳一下

一it用作实词

表达以下概念：指代前文提到的事物，前文中的this，that;替代前文中的内容;指代一位性别不明的小孩或未知的人;指代未指明但谈话双方都知道的那件事;指代时间、天气、气候、距离等自然现象。

二it作形式主语

it替代作主语的从句、动词不定式、动名词，而把真正作主语的从句、动词不定式、动名词置于句尾。

1. it作形式主语代替从句的句型：

(1) It+be+名词词组+that从句。

例：It’s a wonder that you could finish the hard task in such a short time.

(2) It+be+adj. +that从句

It is/was surprising(important, desirable, advisable…) that…。在这个句型中，从句的谓语动词常用虚拟语气，即“should+动词原形”或“should have+过去分词”。

例：It’s important that you should apologize to her for your rudeness.

It’s strange that he should have gone away without telling us.

(3) It+v.+sb.+that从句

It+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze /bother/frighten/please/anger sb.that…

例：It worried me that she drove so fast.

(4) It is/was desired(suggested, settled, proposed, requested, decided…) that…。在这个句型中，从句的谓语动词常用虚拟语气，即“(should)+动词原形”。

例： It was requested that the play should be put on again.

(5) It+be/seem+adj.(good, true, wonderful, wrong, clear, possible, certain…)+that从句

例：It is likely that they will beat us tonight.

2. it作形式主语代替不定式的句型：

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

此处adj. 通常为描述事件的形容词：easy, difficult, hard, necessary, unnecessary, possible, impossible, likely, unlikely, right, wrong, important, unimportant, legal, illegal, well-mannered, ill-mannered, polite, impolite, clear, obvious, certain, suitable, proper, fit, useful, useless, dangerous…

例：It is illegal (for a teenager) to drive a car without a license.

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

此处adj. 通常为描述人的形容词：kind, unkind, nice, rude, cruel, considerate, thoughtful, thoughtless, careful, careless, silly, foolish, stupid, clever, wise, crazy…

例：It’s kind of you to help me with the problem.

3. it作形式主语代替动名词的句型：

It’s no good/use doing…

It’s (well) worth doing…

It’s (well) worthwhile doing…

例：It’s no use crying over spilt milk.

三it作形式主语的句型

1. It takes sb. some time to do sth.某人用多长时间做某事

It took the men a week to mend our roof.

2. It’s (about/high) time that…是该做某事的时候了

It’s(about/high) time that we should take action.

3. It’s the x-th time(that)…第几次做某事了

It’s the third time that he has failed the driving test.

四it作形式宾语的常见句型

1. verb+ it+ adj./noun (for/of) to do/clause(verb=think, believe, suppose, consider, feel, make, keep…)

例：I think it hard for you to do the task on your own.

I think it hard that you’ll do the task on your own.

2. verb+it+adj./noun (one’s) doing

(verb=think, believe, suppose, consider, feel, make, keep…)

(adj.=useless/worth/worthwhile)

(noun=no use/no good/worth one’s while/a waste of time/money/energy/words)

例：I’ll make it worth your while telling me about his secret.

3. verb+it+ important/unimportant/necessary/unnecessary/natural/essential that … (should)…

(verb=think, believe, suppose, consider, feel, make, keep…)

例：I think it important that you (should) attend the conference.

4. verb + it+ as+ noun/adj.+ clause (verb=accept, regard, take, see, view)

例：The lecturer takes it as encouraging when so many students attend his lecture.