which该怎么用

which该怎么用

pron.（代词）
1，哪一个，哪一些：特定的一个或那些：
Which of these is yours?
这些里面哪个是你的?
The one or ones previously mentioned or implied, specifically:
2，那一个，那一些：先前提到的或暗指的那个或那些，尤其是：
在从句中用作关系代词为其先行词提供额外附加信息：
my house, which is small and old.
我的房子，又小又旧

3，用在前面带有that 或一介词的从句中作关系代词，定语从句用以给先行词下定义或做限制：
that which he needed; the subject on which she spoke.
那他所需要的；她谈到的话题

4，用以取代that 在从句中作关系代词，该从句限制或给其先行词下定义：
The movie which was shown later was better.
后来上映的电影较好看

5，任一：任一个规定或暗示的事、事情、人；任一：
Choose which you like best.
选你最喜欢的
A thing or circumstance that:
那事情，那情况：
He left early, which was wise.
他早早地离开，那是很明智的

adj.（形容词）
1，…那个：一定数目的人或物中特定的一个或一些：
Which part of town do you mean?
你是说城镇的哪个地区?

2，任一个，任一些；无论哪个：
Use which door you please.
随便你用哪个门

3，…的那个：先前提及或暗指的那个：
It started to rain, at which point we ran.
天开始下雨时，我们跑了起来

which只能代表东西或动物：
I want to take away the book which you showed me yesterday. 我想带走你昨天给我看的那本书
当它在从句中作宾语时常常可以省略：
This is the book (which) you want. 这是你要的书。
which还可在从句中作介词的宾语：
The situation which he found himself in was difficult. 他的处境非常困难。

在这种从句中，只有which可以紧跟介词，that则不可以(在最后两个例句中which都不能换作that)。如果which不紧跟介词，则一般可换为that，也可以省略：
This is the house (which/that) I went into. 这就是我进去过的那座房子。
which的特殊用法：
在非限制性定语从句中，which可以代表主句的一部分甚至全部，而不仅限于一个名词或代词，而which引起的从句用作修饰整个主句：
This I did at nine o’clock, after which(=doing it) I sat some time reading the paper. 我九点钟坐了这事，之后我就坐着看了一会儿报纸。
He invited us to dinner, which was very kind of him. 他请我们去吃饭，这是他难得的好意。
which在从句中还可用作定语：
He advised me to hide behind the door, which advice I took at once. 他让我躲在门后，我立即照做了。
He studied computer science, which knowledge is very important today. 他学的是电脑，这门知识现在很重要。
which有时代表后面的意思：
He hung around for hours and，which was worse，kept me from doing my work.
他闲呆了好几个钟头，更糟糕的是，这使我也没法工作。

在书面语中，有时还把这类从句写成独立的句子：
From which he learned a few lessons which were later of value to him. 从中他得到了一些教训，对他后来很有用处。
which还可和不定式一起用：
Allow me one minute in which to change my costume. 给我一点时间换装。

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