近年来，UKiset考试越来越火爆。每一项的得分都显得非常重要。我们今天来聊一聊UKiset考试中语法知识点吧。
关系代词that引导定语从句，既可以指人也可以指物，在从句中充当主语或宾语，经常可以与which, who, whom替换使用，可是却存在一些只能用that不能用其他代词的情况。想必我们对这个语法点也是非常了解的，可却苦于记住这些特殊情况，以致对该语法点掌握的并不彻底，今天，我们就运用口诀来帮助记忆这一考点。
只用 that 词限制
不定指代和修饰
高级序数也同理
人物共存和唯一
除词之外看句子
避免重复there be
主从句中作表语
在这组口诀中，存在只用that的七种情况。
只用that词限制，不定指代和修饰
1.当先行词被不定代词所指代或被不定代词所修饰时
如everything，anything，nothing(注：没有something)，none，some，any，few，little，every，each，no，all，much等。
He told me everything that he knows.
All the books that you offered has been given out.
高级序数也同理，人物共存和唯一
2.当先行词被形容词最高级和序数词所指代或修饰时
This is the best film that I have ever read.
That is the second time that I have been to Japan.
3.先行词既指人又指物时
We talked about the persons and things that we remembered.
4.先行词被the only, the very, the same, just修饰时（皆表示“唯一的…;正是..”含义）
He is the very man that I want to see.
After the fire in his house, the car is the only thing that he owned.
This is the same bike that he lost.
以上四种情况皆是受先行词及其修饰语的限制，下面三种情况则是句式上的限制。
除词之外看句子，避免重复there be 主从句中作表语
5.句中已经有who或which，为了避免重复
Who is the man that is making a speech?
Which is the course that we are to take ？
6.There be句型中，句子的主语是先行词且指物
There are two letters that I have to reply to.
注:There be句型中，句子的主语是先行词如果指人，关系代词常用who
There is a pretty girl who wants to see you.
7.先行词为主句的表语，或关系代词在从句里作表语时
That’s a good book that will help you a lot.
那是一本对你很有帮助的好书。
My hometown is no longer the place (that) is used to be.
我的故乡已经不再是过去的那个样子了。
此外，还有三种不能用that，只能用which, who, whom的情况：
1.非限制性定语从句中
He has a son, who has gone abroad for further study.
2.“介词+关系代词”结构中
I like the person to whom the teacher is talking.
3.先行词本身是that时，关系词用which；先行词为those, one, he时多用who。
Those who respect others are usually respected by others.
以上就是小编为大家整理的关于UKiset语法知识点。更多UKiset数学试题、UKiset推理考试等问题可以咨询我们。
