it是个代词,可以做人称代词和非人称代词。
做人称代词时:
1,代替全面已提到过的事物,避免重复
例如:where is my book? it is on the desk.
2, 用于指动物或性别不详的婴儿,以及指代不明确的人。
例如:Look at the baby. it's my nephew.
The door bell is ringing. who is it?
3,用于指抽象事物。
例如:thank you for your help, i'll never forget it.
做非人称代词时:
1,it可以指天气、时间、地点、温度、距离等。
2,可以充当形式主语和形式宾语。
例如:it is important to study English.
3,强调
例如:It was my teacher who called my up.
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