什么时候的定语从句只能用that

什么时候用“whay”引导定语从句？~

应该是what引导的定语从句。例如：
What was impossible 50 years ago may be quite possible today .
50年前不可能的事情今天可能是完全可能的。
She told them what she had seen there.
她告诉他们她在那里看到了什么。
They are building a second library in what was once the school cinema.
他们正在学校的电影院里建第二个图书馆。
定语从句，一个简单句跟在一名词或代词后(先行词)进行修饰限定，就叫做定语从句。在主句中充当定语成分。 被修饰的词叫先行词。定语从句不同于单词作定语的情况，它通常只能放在被修饰的词(即先行词)之后。

宜用that，不用which或who，whom的场合
1. 当先行词是不定代词或被不定代词修饰时。如 Tell me everything that you know. / All the people that are working are my workmates.
2. 当先行词是序数词或被序数词修饰时。如 I want the first that looks bigger. / This is the third dictionary that I have used.
3. 当先行词是最高级或被最高级修饰时。如 Tom is the best that I have ever taught. / The most important thing that she can do is to go to bed at once.
4. 当先行词是the only (“唯一的”)，the very (“恰恰；就”)，the just (“恰恰；就”)，the same (“相同的”)，the last (“最后一个”)等或被这些词修饰时。如 The only thing that I need to do is to cook a meal. / He’s the very person that I want to find. / Did you miss the last problem that is in your math test?
5. 当先行词是数词时。如 You can catch the four that are dead.
6. 当先行词作表语时。如 My hometown is no longer the place that it used to be.
7. 当先行词中既有人，又有物时。The young man and his bike that I saw just now are still there.
8. 当句子中含有两个定语从句时，如果其中一个定语从句的引导词用了which、who、whom，则另一个定语从句的引导词用that，以避免重复。 如 The TV set which I bought from the shop that opened last month was broken. / The man who is standing behind the people that are playing cards is my uncle.
9. 当which、who、whom作疑问词，引导特殊疑问句时。如 Which took the camera that was made in Japan? / Who knows the boy that lives upstairs?

望采纳！

定语从句只能用that
(1) 如果先行词是all, much, anything, something, nothing, everything, little, none等不定代词，关系代词一般只用that，不用which。例如：
All the people that are present burst into tears.
Is there anything that I can do for you?
(2) 如果先行词被the only, the very, the same, the last, the best等词修饰，关系代词常用that(指人时，可以用who),例如：
This is the very book that I want to find.
That is the best film that we have seen.
I was the only person in my office that/who was invited.
(3) 当先行词被all, every, no, some, any, little, much所修饰时；

You can take any seat that is free.
(4) 当先行词被序数词或形容词最高级所修饰时。
It is the first foreign book that I have ever seen.
This is the most beautiful flower that I have seen.
(5) 在there be句型中，常用that.
There is a man that lives in that village.
(6) 先行词有两个，一个指人，一个指物，关系代词应该用that。例如：
The boy and the dog that are in the picture are very lovely.

(1) 先行词是形容词最高级或者它的前面有形容词最高级时
This is the best that has been used against air pollution(反对空气污染) in cities.
English is the most difficult subject that you will learn during these years.
(2) 先行词是序数词,或它的前面有一个序数词时
He is the last person that I want to see.
(3) 主句中已有疑问词时以who或which引导的特殊疑问句，为避免重复，只能用that.例如：
Who is the girl that is crying？ 正在哭泣的那个女孩是谁？
Which is the bike that you lost?
(4) 先行词既有人又有物时
The bike and its rider that had run over (撞倒了)an old man were taken to the police station.
(5) 先行词是all,many，much,any，little,something,everything,anything,nothing,none,the one等代词时
You should hand in all that you have.
We haven’t got much that we can offer you.
I mean the one that you talked about just now.
(6) 先行词前面有only,any,few,little,no,all,one of,the same,the very，the last等词修饰时
The only thing that we can do is to give you some money.
Li Ming is the only one that got full marks (满分)in our class.
Li Ming is one of the students that want to be teachers in our class.
(7) 有两个定语从句,其中一个关系代词已用which,另外一个宜用that
Edison built up a factory(办了一个工厂) which produced things that had never been seen before.
大概时这些了

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