江苏省无锡新领航教育咨询有限公司高中英语《It作形式主语》练习_高考复习指南

　　动词不定式，动名词或主语从句作主语时，通常把它们放在谓语动词前，而用 it 作形式主语，放到句首，常见句型有：

　　1. It + be + 形容词主语从句，如：形容词+主语从句，

　　It is uncertain whether he can come to Jenny’s birthday party or not.

　　It + be + 形容词 + （for sb.）+ 动词不定式等作表语，

　　*这类句型常用形容词 easy, difficult, hard, important, possible，wise 等，

　　*为了强调不定式动作的执行者，为了强调不定式动作的执行者，常在不定式前加 for sb，如：

　　It’s necessary for the young to master two foreign language.

　　It is unwise to give the children whatever they want.

　　It + be + 形容词 + (of sb.) + 动词不定式，

　　*这类形容词常是表示心理品质性格特征的如：kind, nice stupid, clever, foolish, polite, impolite, silly, selfish, considerate 等。

　　*某人和这些形容词可以构成主系表结构。如：

　　It’s very kind of you to help me with the work. =You are kind to help me.

　　It seemed selfish of him not to share his dictionary with others.

　　=He seemed selfish not to share his dictionary with others.

　　(3)It + be +名词词组 + 动词不定式，

　　It is not a good habit to stay up too late.

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