5．The letter _______ I received from him yesterday is very important. 　

A. who　 　　　　　　　 　　　　　　　 B. where　 　　　　　　　　　　　　　 C. what　 　　　　　　　　　　　　　　 D. that

4． ---Does the teacher know everybody _______ planted the trees?

　---Yes, he does.

　A. which　 　　　　　 　　　 B. whose　 　　　　　　　　　 C. where　 　　　　　　　　　　　　　 D. who

3．Do you know the young lady ____your mother is talking?　

A. who　 　　　　　　　 　　　 B. whom　 　　　　　　　　　　　　　 C. with whom　 　　　　　　　　　 D. which

2. The man _________is wearing a blue jacket is Jim's uncle.

A. who　　　　　 　　　　　　 B. whom　　　　　　 C. which　　　　 　　　　　　　 D. /

She has much work that she must do.=She has much work to do.她有许多要做的工作。

The man in the car is Mr. Green.=The man who is in the car is Mr. Green.在车上的人是格林先生。

The girl watering flowers there is my sister.=The girl who is watering flowers there is my sister.在浇花的女孩是我妹妹。

The boy saved in the river has come back to life.= The boy who was saved in the river has come back to life.从河里救起的男孩苏醒过来了。

[语法过关]

1. --Do you like the pop singer?

　　 --No, I prefer the singer __________can sing folk music.

A. which　　　　　　　 　　 B. who　　　　　 　　　　　　 C. where　　　　 　　　　　　　 D. how

2．where指地点(where=in等介词+which)：

This is the house where(=in which) he lived last year.这是他去年住的房子。

1．when指时间：

I will never forget the time when we worked on the farm.我将永远不会忘记我们在农场劳动的那段时光。

当关系代词在定语从句中作宾语时，如果定语从句中的谓语动词是不及物动词时，要加介词或副词。(定语从句中的不及物动词加介词或副词构成固定的及物动词短语后，不能把介词或副词提前到关系代词前。)

He is the old man who/whom we looked after last year.他是我们去年照顾的那个老人。

That is the book which I am looking for.那就是我要找的书。

当关系代词在定语从句中作主语时，定语从句中的谓语动词要与先行词的人称和数保持一致(我们要知道，关系代词所代指的就是先行词，这里有一个等量关系)。

Tom is one of the boys who are from the USA. Tom是众多来自美国的男孩中的一个。

Tom is the only boy that is from the USA. Tom是惟一从美国来的男孩。

The girl to whom I talked just now is from America. 我刚刚与之谈话的那个女孩是来自美国的。