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语法精讲 IT的用法 1.用作人称代词，代替前文提到过的事物 The frog is not a warmblooded animal.It is cold-blooded one. 2.用以代替指示代词this,that —What is this? —It is a flag. —It is hers. 3.起指示代词的作用，指一个人或事物 —Who is knocking at the door? —It is me. —Who is making such a noise? —It must be the children4.指环境情况等 It was very quiet(noisy)at the moment. 5.指时间、季节等 —What time is it? —It is eight o’clock.It often rains in summer. 6.指距离 It is five kilometers from the office to my home. 7.形式主语it的用法 It is+clear+that (2)It is+cruel(kind,brave,nice,rude,wise,stupid,clever,foolish,polite…)+of sb.+ to do sth. (3)It is important(necessary,possible,impossible,easy,difficult,hard…)+for sb.+to do sth. ①It is foolish of you to waste money. ②It is silly of him to say that. 介词for和of的区别依前面的那个形容词而定。如果那个形容词指的是一种行为的性质，就要用for;如果那个形容词指的是行为的性质，同时又指行为的人，就用of。换句话说，单说行为的用for,如necessary一词，仅指“行为”，而无法指“行为者”；而说及行为者的用of，如kind一词，可以说“你的行为是亲切的”，也可以认为作为“行为者的你是亲切的”。 | 
