which的用法是英语学习中的一个难点，下面小编给大家归纳它的相关用法，希望能对大家有所帮助：

1、在问句中作疑问代词,在名词从句中作为连接代词用,其含义为“哪儿,哪些”.

2、如果非限制性定语从句的先行词不是指主句内容,而是指具体的人、时间、地点,则不用which.

3、在后置的非限制性定语从句中代替上文出现的事物或者情况(单数或复数).

下面主要讲解一下在定语从句中的常见用法：

一、关系代词that和which在定语从句中作主语和宾语,放在先行词和定语从句之间,起联系作用,指物时,一般情况下可互换,如：

A plane is machine that/which can fly(that/which指物,做主语)

The man that works in this room is a chemist(that 指人,作主语)

Here is the pen that/which you lost yesterday(that/which 指物作宾语)

He is the most careful boy that I know(that指人,作宾语)

二、关系代词在主语从句中作主语时,从句的谓语动词的人称和数须贺先行词一致.

wheat is a plant that/which is grown in the north of China.

三、that、which在从句中作主语时,不能省略.作宾语时在口语中和非正式问题中经常省略.如上例1和3中的that、which都可省略.

四、在定语从句中,关系代词that和which指物时,一般没有区别,但下列几种情况中不能互换：

1、只能用that的情况：

a、先行词被序数词所修饰时：

The first thing (that) we should do is to work out a plan.

b、先行词被形容词最高级所修饰时：

This is one of the most exciting football games(that)I have ever seen.

The nanjing yangtse river bridge is the longest bridge (that) they ever seen.

c、先行词为all、everything、nothing、anything、little等不定代词(something后也可以用which)：

Is there anything (that) I can do for you town?

That is all (that) I Know.

d、 在“the time when”等结构和某些事件状语中,when常被that代替,而且that往往被省略.

I may leave here any time I want to.

During the time I was there I visited him twice.

e、当先行词中即有人又有物时：

The man and the car (that)you want to see are all here .你想见的人和车斗在这.

f、that 可指人,which则不能.

g、 way 后面可根由that引导的定语从句,但that一般都省略：

That was the way she looked after us.

who is the man that is reading new paper over there?

h、先行词被形容词最高级修饰时：

This is the only thing (that) we can do now.

He gave me the same pen (that) were written by Lu Xun?

2、在下列情况下,只能用which

a、放在介词后面做介词定语时：

This is the question about which we’ve had so much discussion

但是,如果把介词放在从句后部.这时which 就可换为that并常省略,如上例可以改为：

This is the question that we are had so much discussion about.

b、在非限定性定语从句,无论指物指人,都不能用that,指物时,只能用which和其他关系代词,如：

All the books there,which have beautiful pictures in them,were written by him.