定语从句that which的区别和例句总结如下：

定语从句that which都可指代物，但用法有所不同。

一、限制性定语从句中：

A.在从句中作主语时，可用which或that，which较正式，that较常用

You need to understand the requirements that/which are important to customers.

 你要理解对顾客而言重要的需求。

This is the cup that/which was bought by my mother.

 这是我母亲买的杯子。

B.在从句中作宾语时，可用which或that，或省略关系词

The book which/that I borrowed from Jane was interesting. 

我从简那里借的书有意思。

= The book I borrowed from Jane was interesting.

在从句中作宾语时，若介词提前，则只能用which，不用that，此时which不可省略

She has the design for which she is admired by her colleague. 

她拥有令她的同事艳羡的设计。 (which不可省)

C.若先行词有all, everything, little, much, none, nothing等时，用that

There is nothing (that) you can do. 

你对此也无能为力。（从句中作宾语时可省）

This is all that I want to say. 

我要说的就是这些。

There wasn't much that she couldn't do. 

她能做的事很多。

There is little water that can be used. 

可以用的水几乎没有。

D.若先行词带有形容词最高级或序数词时，则用that

This is the most interesting movie (that) I have ever seen. 

这是我所见过的最有趣的电影。（从句中作宾语时可省）

This is the best price that is available. 

这是可以提供的最好的价格。

It was the first movie that I saw. 

那是我看的第一部电影。

F．先行词有the very/the only/the same等修饰时，常用that

This is the very bag that I want to buy. 

这正是我想要买的包。

The only thing that I can do is to move on. 

我唯一能做的事就是往前看。

G．关系词在从句中作表语时，用that，或将that省略

My hometown is no longer the town (that) it used to be ten years ago. 

我的家乡已经不是十年前的那个小镇了。

H．若先行词包含有人和物时，常用that

She talked about earth and men that Aristotle once talked about. 

她谈论了亚里斯多德曾经谈论过的地球和人类。

I．主句以疑问词which开头时，常用that，以避免重复

Which is the car that you bought last month?

 哪辆车是你上个月买的？

Which is the bag that you mentioned? 

哪个是提到的那个包？

J.强调句中，用that： It is….that….

It was orange juice that I ordered. 

我点的是橙汁。

It was the exam that made him nervous. 

让他紧张的是考试。

K.先行词是that时，为避免重复，常用which

It was that which caused the accident. 

是那个引发事故的。

That which is mortal is not immortal. 

会死的则非永生。

二、非限制性定语从句中：

A.用which ，不用that

The bike, which I bought last month, seats three people. 

我上个月买了这辆自行车，它能载三个人。

She played football, which is a sport different from basketball. 

她踢足球，足球是不同于篮球的一种运动。

以上就是定语从句中关系词that which的区别，希望对你有所帮助。你可能还想进一步查阅：定语从句that which省略