it是英语学习中用的最多的代词，精品学习网高考频道整理了it的固定句式，希望大家能认真复习这些必考点!

第一，it作形式主语的常见句型?

(1)it替代动词不定式的常见句型为：?

①It+ be+ adj+ (for sb.) to do sth. ?

此处的形容词通常为描述事件的形容词：easy, difficult, hard, necessary, unnecessary, possible等。如：?

It is illegal for a teenager to drive a car without a license. ?

②It +be+ adj.+of sb. to do sth. ?

此处的形容词通常为描述人的形容词：kind, unkind, nice, rude, cruel等。如：?

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

(2)it替代动词-ing的常见句型： ?

It’s no good/use doing...?

It’s (well) worth doing...

如：It’s no use crying over spilt milk. ?

(3)it替代从句的常见句型： ?

①It +be+n.+that从句?如：?

It is no secret that the president wants to have a second term in office.??

②It +be+adj.(important, necessary, surprising...)+that从句 ?

从句中的谓语动词用"should+动词原形"形式，且should可省略。如：?

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

③It +v.+sb.+that从句= It +be+ v-ing +that从句?如： ?

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

④It+v.(+to sb.)+ that从句 ?

常用动词或短语有appear, seem, come about, emerge, follow, chance, happen, occur, transpire, turn out, work out等。如： ?

It (so) happened/chanced that they were out.(= They happened/chanced to be out.) ?

⑤It +be+ v-ed +that从句 ?

常用动词有say, report, think, believe, hope, expect, agree, accept, decide, determine, intend, plan, understand, know等。如： ?

It is said that the couple have gotten divorced.(=The couple are said to have gotten divorced.) ?

⑥It +be +v-ed + that...(should)...?

常用动词有demand, request, require, order, suggest, advise, recommend等。如：?

It is suggested that they should begin with the third question.