什么情况下，定语从句中只能用that？
本文将解决这个问题。为大家总结，只能用关系代词that引导的定语从句之九种情况。
在定语从句中，当先行词表示物的时候，引导定语从句的关系代词，可以用that, 也可以用which. 但是通常在以下几种情况下, 只能用that, 同学们在学习过程中要引起注意。
1.当先行词为all, much, none, something, nothing, everything, the one, few, little, many, anything等不定代词时。例如：
We should do all that is useful to the people. 我们应该做一切有益于人民的事情。
Is there anything that I can do for you?有什么需要我帮忙的吗？
There’s nothing that can be said about it关于这件事，已没有什么可说的了。
Do you mean the one that you bought yesterday?你指的是昨天买的那个吗？
2 当先行词被only, any, few, little, no, all, many, much等不定代词修饰时。例如：
I have finished reading all the books that I borrowed from the library. 我己经看完了所有从图书馆借来的书。
He has learned many English new words that the teacher taught him last week by heart.
上周老师教的许多新英语单词，他都用心记住了。
The only thing that we can do was to wait. 我们唯一能做的事情就是等待。
3.当先行词被序数词、形容词最高级以及the only, the very, the next, the last等修饰时。例如：
This is the first book that I bought in the shop . 这是我在这家书店买的第一本书。
This is one of the most exciting football games that I have ever watched 这是我看过的最激动人心的足球赛之一。
This is the last film that has been shown in our city this year.这是我市今年放映最后一部影片。
4当先行词是形容词最高级时。例如：
This is the best that can be done now.这是现在能做的最好的办法。
5.先行词既指人又指物时。例如：
We talked of things and persons that we remembered. 我们谈起了我们记住的人和事儿。
6.关系代词在限制性定语从句中作表语，并带有比较的含义时。例如：
Our school is no longer the school that it was ten years ago .我们学校已经不再是十年前的样子。
7.句子的前一部分已经出现了which,为避免重复，句子的后面部分通常不再用 which而用that来引导限制性定语从句.例如：
Which is the book that you bought yesterday? 哪一本书是你昨天买的？
8.当主句是以who , which 引起的特殊疑问句时，关系代词通常只用that. 例如：
Who is the man that you spoke to just now? 刚才和你说话的那个人是谁？
9.在there be句型中,只能用that,例如：
There was still a lot of homework that we had to do in our spare time.
我们在业余时间仍然必须做很多作业。
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