1、引导非限制性定语从句时：Bruce went toward the fire, which was still smoking.

10、that在有些句型中可作为关系副词，且可省略。

I don’t like the way (that) he talks to me.

9、当先行词是集体名词时，多用that，

He wants to join the team that won the game.

8、当关系代词在从句中作表语时。(只限于限制性定语从句中)

China is no longer the country that it used to be.

7、在同一个句子里，若有两个定语从句，其中一个关系词已用了which， 另一个宜用that.

Edison built up a factory which produced things that had never been seen before.

6、当主句是以who或which开始时的特殊疑问句时，

Who is the boy that won the gold medal?

5、先行词既有人又有物时，

Later they talked of things and persons that they remembered in the school.

4、当先行时前有such 或the same修饰时，先行词和关系代词指同一物时。

She is wearing the same dress that she wore yesterday.

3、先行词被序数词或形容词最高级修饰时，或先行词本身就是序数词或形容词最高级时。

This is the most interesting film that I’ve ever seen.

2、先行词被all, every, no , some, any , little, much, the only, the very, the right, last , few , just 等修饰时。

The only thing that we can do is to give you some advice.