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外研2003课标版《Grammar》最新PPT课件优质课下载
1.1.it的最基本用法是作人称代词，主要指刚提到的事物，以避免重复:
Ningbo is a beautiful city, isn’t it?
1.2.也可以指动物或婴儿(未知性别的婴儿或孩子):
Is this your dog？No, it isn’t.
1.3.也可指抽象事物:
It was a great surprise to me when he did a thing like that．
2.非人称代词it
it有时并不指具体的东西，而泛指天气、时间、环境等，称为非人称的it：
2.1.指天气：
It is a lovely day, isn’t it? It is a bit windy.
2.2.指时间: It was nearly midnight when she came back. 2.3.指环境: It was very quiet in the café. 2.4.指距离：
It is half an hour’s walk to the city centre. 3.it的其他用法
3.1.表示谁在做某事的句子： Who is it? ---It’s me. Her face lighted when she saw who it was. 3.2.用来泛泛的指某件事： So you are going to be married this time？When is it？ It doesn’t matter. It is a shame, isn’t it?
it可用来指代前文提到的人,物或事情,也可以用来指时间,金钱,距离,天气等自然现象
基本用法:
1. S+ think + it + necessary +( for sb. ) to do sth.
The chairman thought ___ necessary to invite Professor Smith to speak at the meeting.(05全国)
A. that B. it C. this D. him
Sentence patterns:
B
…
find
…
possible
feel