"that"和"which"的用法有啥区别?

定语从句(attributive clause)是英语语法中一项重要的学习内容?正确选择关系代词是掌握定语从句的关键?关系代词that和which均可指代先行词是事物的名词或代词,此时两者可互换,但有时that和which的使用场合并不相同?具体介绍如下:

一关系代词that的使用

1.先行词是all, anything, everything, nothing等,关系代词应用that?

That's all that I know.

2.先行词前有the only, the same, the very或no, little, much, any, every, all等修饰时,关系代词应用that?

This is the only reason that I can say.

3.先行词前有序数词或形容词最高级修饰时,关系代词常用that?

The first thing that we should do is to help him.

4.当先行词同时含有"人"或"物"时,关系代词应用that?

Can you see a man and his horse that are crossing the bridge?

5.在固定结构the same...that...; so...that...; such...that...以及it is/was...that...的强调句型中,须用that?

This is the same museum that you once visited.

6.如主句以there be开头时,关系代词应用that?

There is a house that has two windows.

7.当一个句子中含有两个定语从句时,如前一个已用关系代词which,后一个关系代词宜用that,避免重复?但两个定语从句的结