语法讲解

He is the man. He came here last week. who

He is the man who came here last week.

She is the woman. I served the woman yesterday. who/whom

She is the woman who I served yesterday.

He likes the house which has many windows.

当先行词是物时，后边是which。which后有两种情况。

1 主语 + 及物动词。

2 主语 + 不及物动词 + 介词。

This is the letter. I received the letter yesterday. the letter/ which

This is the letter which I received yesterday.

I like the house. He lives in the house. the house/ which

I like the house which he lives in. (which可以省略）

I like the house in which he lives. （which不可以省略）

That is the boy. I talked about the boy last week. the boy/who/whom

That is the boy who/whom I talked about/told you about last week.

That is the boy about whom I told you last week.

当先行词是人时，后边是who/that

当先行词是人且人做宾语时，后边是who/whom/that

1 在从句的情况下，人作主语，后边是及物动词或不及物动词加介词，这样的情况下，关系代词可以省略。

2 如果介词提前了，介词后只能加whom

当先行词是物时，后边是which/that，如果从句是进行时态，which和be动词都可以省略。

当先行词是物时，关系代词是which/that，后边是人或物都可，后边接及物动词或不及物动词加介词，which/that 作宾语，则可以省略

如果是不及物动词加介词情况下，把介词提前，只能用which.

当先行词是人和动词时，后边是that

I saw a boy. The boy and his dog were walking in the park.

I saw a boy and his dog that were walking in the park.

当先行词前由序数词、最高级以及the only, the very, the same, all所修饰，或先行词为nothing, anything, everything 等不定代词时，后边的关系代词只能是that.

以who/what/which开头的疑问句，后边的关系代词只能是that.