精品学习网小编为大家准备了这篇高中英语It用法及其句型和固定搭配，帮助大家对it有更多了解。接下来我们一起来看一看。

高中英语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，又是近几年高考的热点，因此应给予充分的重视，现将it用法归纳如下：

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用作形式主语

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。

It 作形式主语的常见句型：

1. 代作主语的动词不定式，其句型为

(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替代作主语的动名词的常见句型

It's no good/use doing…

It's (well)worth doing…

It's (well)worth one's while doing/to do…

It's (well)worth while doing/ to do

例 It's no use crying over spilt milk.

2. It替代作主语的从句常见句型

(1) It is + noun +从句

例 It is no secret that the president wants to have a second term atoffice.

(2) It is adj. +clause

It's surprising that… (should)………竟然……

It's a pity/shame that…(should)………竟然……

例 It's important that you should apologize to her for your

rudeness.(=It's of much importance that you should apologize to her for your rudeness.)

(3) It verb sb. + clause= It is v-ing + clause

It+surprise/delight/interest/disappoint/worry/disturb/annoy/amaze

/bother/concern/frighten/please/anger sb. that…

例 It worried me that she drove so fast.(= It was worrying that she