4.关系代词

1. who 与 whom

who 在从句中用作主语，whom 在从句中用作宾语，两者都指人。如：

Do you know the man who is standing there?

你认识站在那儿的那人吗?

That is the woman whom I met on the street yesterday.

那就是我昨天在街上遇到的女人。

2. whose

whose 在从句中用作定语，可指人也可指物。如：

Did you meet a boy whose name is Tom?

你遇到过一个名叫汤姆的孩子吗?

3. which

which 在从句中可用作主语、宾语和表语，通常指物。如：

The building which stands by the river is our school.

坐落在河边的那幢楼是我们学校。

4. that

that 可用来代替 who，whom 和 which。如：

He is not the man that he was before.

他现在不是过去的他了。

5. as

一般来说，as 引导的定语从句，其先行词都有 such 或 the same 来修饰。如：

He is such a good teacher as his father is.

他和他父亲一样是位好教师。(as 在从句中用作表语)