动漫少女掏肠血腥:定语从句中当先行词是物时，什么时候用that ？什么时候用which

that和which都指事物时，一般可以通用。但在下列情况下必须用that，而不能用which:

1先行词为all，everything, nothing, something, anything, much little, few, none, the one等时。例如：

Say all(that)you know.把你知道的全部讲出来。

Is there anything(that)I can do for you now?现在需要我为你做点什么吗?

This book contains much little that is useful.这本书中有很多(没有多少)有用的东西。

I mean the one that was bought yesterday.我指的是昨天买的那个。

2先行词为数词或被序数词(含last)修饰时。例如：

This is the first film(that)I have seen since I came here.这是我到这里以来所看的第一部电影。

The last place they visited was the Summer Palace.他们最后参观的地方是颐和园。

Look at those presents. You can see the two that you gave me.看那些礼物，你能看见你送我的那两个吗?

3先行词被形容词的最高级或the very, the only等所修饰时。例如：

This is the biggest apple(that)I have ever eaten.这是我所吃到的苹果中最大的一个。

She is the very thief(that)the policeman is looking for.她就是警察正在寻找的那个小偷。

Mary is the only friend(that)I have in Australia.玛丽是我在澳大利亚唯一的朋友。

4先行词中既有人又有物时。例如：Peter and his car that disappeared mysteriously in London in 1987 appeared mysteriously in New York in 1993.彼得和他的小轿车1987年在伦敦神秘地失踪，后来于1993年又神秘地出现在纽约。

We were deeply impressed by the teachers and schools that we had visited.我们访问过的老师和参观过的学校给我们留下了深刻的印象。

5先行词在主句中作表语，或关系代词在从句中作表语时。例如：

This is a dictionary that will help you a lot.这是本对你很有帮助的字典。

Don't cheat me. I'm no longer the boy that I was three years ago.别骗我了，我再也不是三年前的我了。

[注2]在下列情况下不宜用that:

1.关系代词前有介词时。例如：

This is the house in which I lived ten years ago.这就是我十年前住过的房子。

2.先行词本身是that时。例如：

What was that which he said?他说了些什么?

[注3]whom,which和that在定语从句中作宾语时，特别是在口语中，往往可以省略。例如：

The man(that)you got the news from is a friend of mine.告诉你这个消息的人是我的朋友。

Is that the car(which)you want to buy?那就是你所要买的汽车吗?

This is the little boy(whom)Comrade Li saved yesterday.这就是李同志昨天救的那个小男孩。

看完楼上的晕了
只能用that作为定语从句的关系代词的情况
a) 在there be 句型中，只用that，不用which。
b) 在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，只用that，不用which。
c) 先行词有the only, the very修饰时，只用that。
d) 先行词为序数词、数词、形容词最高级时，只用that。.
e) 先行词既有人，又有物时。

举例：
All that is needed is a supply of oil.
所需的只是供油问题。
Finally, the thief handed everything that he had stolen to the police.
那贼最终把偷的全部东西交给了警察。
除了以上情况,先行词指物的都可用which.