it、that 、 as分别有哪些意思和用法
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1. it 1)人称代词,可以代替天气,星期,日期等,It is July 22nd/Saturday/sunny.

' 2) 指代上文中提到的事物 This is an enteresting book, I bought it yesterday.

3) 作形式主语的句型:It is +adj. for /ofsb. to do sth.

2. that 1) 指示代词:那个 This is a pen, that is a book.

2) 连词:连接宾语从句,定语从句

He said that he had finished his homework.

This is the first computer that I have bought.

3. as 1)连词 因为,由于 As ti is very late,we must go home now.

2) 介词 作为As a student, we should study hard.

3) 副词 和...一样 Tom is as tall as his father.

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