4. which指物，在定語從中作主語或賓語。例如：

　　A dictionary is a book which gives the meaning of words.

　　Here is the book (which) the teacher mentioned yesterday.

　　5. that多指物，有時也指人，在定語從句中作主語或賓語。例如：

　　I’ve read the newspaper that(which) carries the important news.

　　Who is the person that is reading the newspaper over there?

　　6. when 指時間，在定語從句中作狀語。例如：

　　I’ll never forget the time when we worked>He arrived in Beijing>

　　7. where 指地點，在定語從句中作狀語。例如：

　　This is the house where we lived last year.

　　The factory where his father works is in the east of the city.

　　四. 關系代詞 whom， which 在定語從句中作介詞賓語時，可以和介詞一起放于先行詞與定語從句之間，有時為了關系緊湊也可以將 whom 與 which 與先行詞緊挨著書寫，而將介詞置于定語從句的后面，如：

　　That was the room in which we had lived for ten years. = That was the room

　　which we had lived in for ten years.

　　五. 具體使用時還要注意下列問題：

　　1. 只能使用that,不用which 的情況：

　　(1) 先行詞是all, few, little, nothing, everything, anything 等不定代詞時。例如：

　　All that he said is true.

　　(2) 先行詞被only, no, any, all,等詞修飾時。例如：

　　He is the>

　　(3) 先行詞是序數詞或被序數詞修飾的詞。例如：

　　He was the second (person) that told me the secret.

　　(4) 先行詞是形容詞最高級或被形容詞最高級修飾的詞。

　　This is the best book (that) I have read this year.

　　(5) 先行詞既包括人又包括物時。例如：

　　He talked about the people and the things he remembered.

　　2. 只能用which，不用that 的情況：

　　(1) 在非限制性定語從中。例如：

　　The meeting was put off, which was exactly what we wanted.

　　(2) 定語從句由介詞+關系代詞引導，先行詞是物時。例如：

　　The thing about which he is talking is of great importance.

　　考查的主要形式是單項填空、完型填空、短文填空和完成句子。閱讀理解和書面表達肯定也要用到定語從句。

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