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修饰物时只用which不用that的情况

1、 引导非限制性定语从句时。例如： 
Bamboo is hollow, which makes it light.竹子是空心的，这使得他很轻。

2、 当关系词前有介词时。例如： 
This is the room in which Chairman Mao once lived.这就是毛主席曾经住过的地方。

3、在一个句子中有两个定语从句，其中一个定语从句的关系代词用了that, 另一个宜用which。例如： 
 Let me show you the novel that I borrowed from the library which was newly open to us.

我来给你看我从新开的图书馆里借来的那本小说。

4、当关系代词后面有插入语时。例如： 
Here is the English grammar which, as I have told you, will help improve your English.

这就是我跟你说过的会有助于你学好英语的那本英语语法书。

5、先行词为that时。例如： 
The clock is that which can tell us the time.钟是报时的装置。