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定语从句中只能用which

定语从句中只能用which，不能用that的几种情况：

1. 在介词后面的关系代词用which而不能用that。即“介词+which(代物)” 例如：

The picture for which he paid $1,000 was once owned by a duke.

他花了1000美元买下的画曾为一名公爵所拥有。

The building in which Han Mei studied was very old.

韩梅在里边学习的那幢大楼很旧。

2. 在非限定性定语从句中不能用that。例如：

Crusoe's dog, which was very old now, became ill and died.

克鲁索的狗，现在已经很老了，病死了。

3. 有两个定语从句，其中一个关系代词已有which，另一个宜用that。相反，如果其中一个为that，另一个宜用which。

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

爱迪生办了一个工厂，生产过去从未见过的东西。

Let me show you the novel that I borrowed from the library which was newly open to us.

让我给你看看我从新开放的图书馆借来的小说。