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.
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