新托福不再单独考察语法，但不能因此就说语法无关紧要，不用复习了。下面前程百利小编给大家分享有关定语从句的托福语法知识，帮助大家提高托福成绩。
我们知道，定语从句可以由不同的先行词来引导，比如that,which,who,whom等等。本文小编为大家总结只能用that来引导定语从句的情况，具体内容如下：
1.当先行词为all, little, much, few, everything, none 等不定代词时关系代词用that而不用which.
I will tell him all that you told me at the ball.
There are few books that you can read in this book store.
2.当先行词既有人又有物时,关系代词用that, 不用which.
He asked about the factories and workers that he had visited.
3.当先行词有形容词最高级修饰时,关系代词用that, 而不用which.
This is the best novel that I have ever read.
Guilin is one of the most beautiful cities that I have ever visited.
4.当先行词有序数词修饰时,关系代词用that, 不用which.
The first sight that was caught at the Great Wall has made a lasting impression on him.
5.当先行词被the only, the very, the same, the right等修饰时,关系代词用that,不用which.
That is the very thing that we can do.
It is the only book that he bought himself.
6.当先行词被all, every, any, much, little, few, no等修饰时,关系代词用that,不用which.
You can take any room that you like.
There is no clothes that fit you here.
7.当主句是以which开头的特殊问句时,定语从句关系代词一般用that而不用which.
Which of the books that had pictures was worth reading?
8.在强调句型" It is ... that ..." 中,只用that,不用which.
It is in this room that he was born twenty years ago.
9.在" such (the same) ... as ..." 句型中,关系代词要用as, 而不用which.
We need such materials as (not which) can bear high temperature.
10.表示" 正如... 那样 "," 正象..." 之意时, 用as, 不用which.
Mary was late again, as had been expected.
11.As 引导的定语从句可以放在主句前面, 也可以放在主句后面或主句中间,而由 which引导的定语从句只能放在主句后面。
As we all know, oceans cover more than 70% of the earth.
以上就是小编为大家分享的有关定语从句的托福语法知识，希望能给大家的学习带来帮助。有关托福语法的更多知识，请关注前程百利托福考试栏目。
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