which 在定語從句中的用法
關係代詞 which 一般指物，在定語從句中作主語、賓語或定語，既可引導限制性定語從句，又可引導非限制性定語從句。下面就進行歸納總結：
1. 引導限制性定語從句
A shop should keep a stock of those goods which sell best.
商店應存有最暢銷的貨物。
This is the family which is planning to move to the party.
這是要搬進城裡的一家。
2. 引導非限制性定語從句。
( 1 )用來指代一個句子。
Internet is so interesting, which makes all possible happen.
因特網是如此有趣，它使任何事都有可能發生。
( 2 )用來指代句子的一部分。
When deep in thought, which he often was, he would forget all around him.
他常常陷入沉思，這時他就會忘掉周圍的一切。
( 3 )如果要引導兩個非限制性定語從句，第二個 which 前要加 and.
He bought a book, which was written by LuXun, and which he decided to give to his friend. 他買了本魯迅寫的書，他決定送給朋友。
3. 名詞+ of + which (= of which +名詞= whose + 名詞)通常放在先行詞的後面。
I'd like a room the window of which looks out over the sea. / I'd like a room of which the window looks out over the sea. / I'd like a room whose window looks out over the sea.
我要一間窗戶面臨大海的房間。
4. 介詞+ which 的替代作用。
( 1 )作時間狀語替代 when 。
There used to be a time at which / during which ( = when ) the Chinese people struggled for freedom.
中國人曾有一段為自由而鬥爭的日子。
( 2 )作地點狀語替代 where 。
This is the office in which ( = where ) I used to work.
這是我過去工作過的辦公室。
( 3 )作原因狀語替代 why 。
I'd like you to explain the reason for which (= why ) you were absent.
我想讓你解釋一下缺席的原因。
( 4 )作方式狀語替代 that 或省略。
There are many ways in which (= that / 省略) we can solve the problem.
解決這個問題有很多方法。
5. which, when, where 關係詞的選擇。
關係副詞 when 與 where 用於引導定語從句時，往往修飾句中表示地點或時間的名詞。但是，有時候在表示時間或地點的名詞後面卻不能用 when 或 where ，而該用 which 或 that 。
Is this the factory which / that produces all kinds of washing machines? ( which / that 在定語從句中作主語，指代前面的 the factory )這就是生產各種洗衣機的那家工廠嗎?
