that什么时候不能用要用which（什么时候只能用which而不能用that）

只用which不用that的情况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，今天小编就来说说关于that什么时候不能用要用which?下面更多详细答案一起来看看吧!

that什么时候不能用要用which

只用which不用that的情况。

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。

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。

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。

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。

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。