定语从句分为限制性定语从句和非限制性定语从句。不同的句子结构，关系代词也不同。什么时候用who？什么时候用that？
E.先行词有序数词修饰时
This is the third time that they have met.这是他们第三次见面,
F.先行词有 the very,the only,the same,any,few, little,no,all,one of等词修饰时
This is the very room thatlslept in that evening.这正是我那天晚上睡过的房间。
G.有两个定语从句，其中一个关系代词己用 which，另一个宜用 that
Edison built up a factory which produced things that had never been seenbefore.爱迪生建了一家工厂，生产过去从未见到过的东西。
只用 which 而不用 that 的情况
4.引导非限定性定语从句时只用 which 而不用 that
The fsh,whichlbought this morning,is very fresh.我今天早上买的魚很新鲜。
My house,which lbought two years ago,has got a lovely garden.
我两年前买的那幢房子，带一座漂亮花园。
Jim passed the driving test, which surprised everybody in the ofhce.吉姆通过了驾驶考试，这使得办公室里的每一个人都很惊讶。(which指“吉姆通过了驾驶考试"这件事。)
补充:which 前常用 none/neither/most/both/each/all/a little of等词修饰
The factory produces half a million pairs of shoes every year, most of whichare sold abroad.这家工厂每年生产50万双鞋，大都销往国外。
B.在限定性定语从句中，关系代词前有介词时只用which而不用 that
I was put in a position in which |had to accept l was less important.
我被置于一个要被迫接受低人一等现实的境地。
说明:介词in 放在了句子的后面，那么关系代词既可以用 which，也可以用 that还可以省略。
This is the hotel in which you will stay.=This is the hotel (which/that) you willstayin.这就是你将要住的旅馆。
C.在限定性定语从句中，如果有两个定语从句，其中一句关系词是that，另一句的关系词就需用 which
Let me show you the novel that l borrowed from the library which was newlyopen.让我给你有看我从新开放的图书馆借来的小说。
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