初中英语定语从句知识点：关系代词引导的定语从句

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　1.who指人，在从句中做主语

　(1)The boys who are playing football are from Class One.

　(2)Yesterday I helped an old man who lost his way.

　2. whom指人，在定语从句中充当宾语，常可省略。

　(1) Mr. Liu is the person (whom) you talked about.

　注意：关系代词whom在口语和非正式语体中常用who代替，可省略。

　(3) The man who/whom you met just now is my friend.

　3. which指物，在定语从句中做主语或者宾语，做宾语时可省略

　(1) Football is a game which is liked by most boys. ( which 在句子中做主语)

　(2) This is the pen (which) he bought yesterday. ( which 在句子中做宾语)

　4. that指人时，相当于who或者whom；指物时，相当于which。

　在宾语从句中做主语或者宾语，做宾语时可省略。

　(5) The people that/who come to visit the city are all here. (在句子中做主语)

　(6) Where is the man that/whom I saw this morning? (在句子中做宾语)

　5. whose通常指人，也可指物，在定语从句中做定语

　(1) He has a friend whose father is a doctor.

　(2) I lived in a house whose roof has fallen in.

　whose指物时，常用以下结构来代替

　(3)The classroom whose door is broken will soon be repaired.

　=The classroom the door of which is broken will soon be repaired.

　(5)Do you like the book whose color is yellow?

　=Do you like the book the color of which is yellow?