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定语从句which 和what 后面所接的东西有什么区别?例子:I have decided to

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定语从句which 和what 后面所接的东西有什么区别?例子:I have decided to
keep a diary about what I eat and how much I exercise.为什么what不能写成which
定语从句:指人时常用which 和 who 而 what 则常用于指物
 
首先你要区分从句的概念,定语从句不是名词性从句.
名词性从句分为:主语从句,宾语从句,同位语从句和表语从句.
 
what可以引导名词性从句,在从句中可做主语、宾语、表语.
 
which是关系代词,引导定语从句,在从句中可充当主语、宾语、表语.引导定语从句的词分为关系代词(which,that,who,whom,whose,as)关系副词(when,where,why),注意:没有what.
 
简单点记吧:定语从句放在表示“事物”的名词后面,且关系代词在从句中充当句子成分,用which.如果不是定语从句,就考虑用what.
如:
1.This is the book which I talked about yeasterday.
(which引导定语从句放在名词book后面起修饰作用,which在从句中充当talk about的宾语)
2.This book is what I talked about yesterday.(what引导名词性从句,放在is之后,what 在表语从句(名词性从句)充当talked about的宾语.)