Although we cannot see it, there is air all around us. (it代替后面的air)
They say he has left town, but I don’t believe it. (it代替前面They…town分句中的情况)
2、代替有生命但不能或不必分阴阳性的东西(包括婴儿)。
e.g. Yesterday we saw a big tree. It was fully twenty metres high. (it代替前面的tree)
The baby cried because it was hungry. (it代替前面的baby)
3、在某些习惯说法中,可以代替人。
e.g. ---- Someone is knocking at the door, Peter. ---- Who is it?
---- It’s me.
---- Who are singing?
---- It is the children.
---- The light is still on in the lab. It must be the third-year students doing the experiment.
4、it与one的区别:这两个词都可以代表前面说过的名词,但it用于同名同物的场合;one则用于同名异物的场合。
e.g. ---- Do you still have the bicycle?
---- No, I have sold it.
---- Is this knife yours?
---- No. It is Xiao Zhang’s. Mine is the one on the desk.
5、it与that的区别:两词都可代替某一特定名词,但that指同一类,并非同一个。
e.g. The climate of South China is mild(温和的); I like it very much.(it指the climate of South China)
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