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英语语法之代词02-it用法

代词
It的用法总结:
1)用来代替前面提到过的人或事。
What’s this?  It’s a desk.
2)指不确定身份的“某人”,一般不必译出。
Who is knocking at the door?  It’s Lucy.
Who is it? It’s me.
3)指天气状况。
It is going to rain. It’s cold now.
4)指时间,日期,天气,环境,距离,度量等。
It’s Sunday today. How far is it from your house to school?
It’s seven o’clock in the morning.
It’s only five minutes’ walk .
5)指环境状况等。
It was very noisy in the classroom.
6)用来代替小孩和婴儿。
The child smiled when it saw its mother.It is a two-month-old baby.
7)代替整个句子。
You have saved my life.     I will never forget it.
You did great.  Keep at it!   你做的很棒,继续保持。
 
注: it和one的区别
It指“同一个”,而one指“同类不同个”。如:
----Your dog is so cute.        (你的狗太可爱了。)
----Do you want one?        (你也想要条狗吗?)
----Yes, but I only want it.     (是的,但是我只想要你的狗。)   

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