定语从句：只能用that引导的十三种情况

1. 在 there + be 的句型中，句子的主语是先行词，而且又是物。
例如：
There are two novels that I want to read. 　我要读的有两本小说。
There is no work that can be done now. 没有什么工作现在能做的了。
2. 当先行词为主句的表语或者关系代词为从句的表语时。
例如：
This is the book that was bought yesterday. 这就是昨天买的书。
Our school is no longer the school that it used to be. 我们的学校不再是以前的学校了。
3. 以 Here is (are) 开头的句子时。
例如：
Here is a film that will move anyone. 这是一部将使任何人受感动的电影。
Here are two books that I will buy. 这是我要买的两本书。
4.It is (high)time + 定语从句中。
例如：
It is time that we should have a rest. 我们应该休息了。
It is high time that they started out. 他们该动身了。
5. 当先行词是 way 等词时，关系代词用 that 或者 in which 在定语从句中作方式状语时，在口语中，常可省略。
例如：
This is the way that my father did this work. 这就是我父亲做此工作的方式。
She admired the way in which I answered the questions. 　她羡慕我回答问题的方式。
6. 在双重限定性定语从句中，如果一个从句用 who 或者 which 引导时，那么另一个从句用 that 引导。
例如：
He is the student that I have ever see who can jump highest. 他是我曾经看到过跳得最高的学生。
My brother studies in the school which is the most beautiful in our city that
isn't far from here. 我的弟弟在我们的城市最美丽的学校读书，并且离这儿不远。
7. 当先行词被 the last , the very 和 the only 修饰时。
例如：
This is the very pen that I am looking for. 这正是我找的钢笔。
The only book I want to read is missing. 我唯一想看的书不见了。
8. 在强调句子中，并且以 who ,which, what 开头时。
例如：
Who was it that was lost ? 　究竟是谁迷路了？（此句中，最好不用 who 来代替 that ，避免重复。）
What was it that you did last week? 　你上周究竟做什么了？
9. 当先行词有序数词时。
例如：
You are the first person that I want to ask for. 你是我要见的第一个人。
This is the second book that I have ever written. 这是我写的第二本书。
10. 当先行词被 all, every, no , some, few , little, much, both 等修饰时，
例如：
This is all that I want to say at the meeting. 这就是我在会上要说的。
Have you any books that are worth reading? 　你有值的看的书吗？
11. 当先行词既指人又指物时。
例如：
The professor and his achievement that I heard about are admired by them .
我听说的那位教授和他的成就得到他们的赞美。
Let's talk about the persons and the things that we can remember. 让我们谈论能够想起的人和事。

12. 当先行词为 anything 、 everything 、 nothing 时，关系代词用 that, 不用 which ；但用 something
时，用 which 或者 that 均可。
例如：
Everything we have seen in China is moving. 　我们在中国看见的东西件件感人。
I have nothing that is worth reading. 　我没有什么值得一读的东西。
13. 当先行词是疑问代词 who 时。
例如：
Who that you have ever seen can beat him in chess? 　你曾见过谁能在棋艺上打败他？
as 的用法：其通常和 such the same 连用，代指物在从句中做主语或宾语
This is the same pen as I bought yesterday 。
这种笔和我昨天买的笔一样（同样的但不是同一个）。引导定语从句的关系词在从句中做宾语，因先行词被 the same 所修饰所以用 as 引导
注意：上句与下句的区别 This is the same pen that I used yesterday. 这就是昨天我使用的那一支钢笔（指的是同一个）。
I studied in the same school as she did in Beijing.
我和他在北京的同一所学校就读。
引导定语从句的关系词在从句中做宾语，因先行词被 the same 所修饰所以用 as 引导
I want to have such a dictionary as he has.
我想要一本和他的一样的字典。
引导定语从句的关系词在从句中做宾语，因先行词被 such 所修饰所以用 as 引导
which 的用法： 关系代词，在从句中做主语或宾语，做宾语时通常可以省略（直接做介词的宾语时除外，不能省。）
The radio which he bought yesterday doesn't work now.
他昨天买的收音机现在坏了。
引导定语从句的关系代词在从句中做宾语，代指物，故用 which.
Can you lend me the book which was written by Lun Xun..
你能借我那本由鲁迅所写的书吗？
引导定语从句的关系代词在从句中做主语，代指物，故用 which.
This is the park which is the most beautiful one in our city.
这是我们这个城市最漂亮的公园。
引导定语从句的关系代词在从句中做主语，代指物，故用 which.
This is the map by which we can get to the forest.
这是张地图，借助它我们能到达那个森林。