what开头的定语从句
下面是小编整理的what开头的定语从句，欢迎阅读。
什么时候用what引导定语从句
what 不是关系词，所以它不能引导定语从句。但值得注意的是：what 有时相当于“名词(先行词)+关系代词”。关系代词有主语、宾语、定语之分。一般who做主语或宾语whom作为宾语，whose作为定语(whom，whose不可省略)。关系代词在从句中作主语，宾语，定语等，关系副词在从句中作地点状语(where)时间状语(when)，原因状语(why)。例如：
1、他把一切都给了我。
正：He gave me what he had.
正：He gave me everything that he had.
2、这就是你要的东西。
正：This is what you want.
正：This is the thing that you want.
以上实例告诉，what 有时相当于“先行词+关系代词”，同时这也告诉，这样用的 what 前不能再有先行词(即what 不能引导定语从句)。
定语从句what和which的区别
what不可以用在定语从句中，定语从句中关系代词用that和which，两者用法上的`区别主要为：
1.that可以指人，也可以指物;which只能指物
2.当先行词是不定代词all, something, anything, everything, none, the one等时，只能用that
如： Is there anything that I can do for you?
3.先行词前有形容词的最高修饰时，要用that
如： This is the best film that I have ever seen for years.
4.先行词前有序数词修饰时，要用that
如： This is the fifth book that I have ever written.
5.先行词前有形容词only, very, few, little等修饰时，要用that
如： She was the only person that was invited to the palace.
6.先行词既指人，又指物时，只能用that
7.在非限制性定语从句中，只能用which
如： She made great progress and won a prize, which gave us a surprise.
8.在介词+关系代词引导的定语从句中，必须用which
如： This is the knife with which John hurt somebody.
9.当先行词本身是that的时候，要用which
如： The predicate is that which is said of the subject.
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