Question

老师请问这句话的语法问题。

Because people interpret happiness for themselves in so many different ways, it is difficult to give any definition that is true for everyone.
老师，这句话中的that是定语从句吗？可以换成what或者which吗？

谢谢老师。

Answer 1

Because people interpret happiness for themselves in so many different ways, it is difficult to give any definition that is true for everyone.
这句话中的that是定语从句 关系代词that引导定从并作定从中的主语
不可以换成what 因为what不能引导定语从句
但可以写成it is difficult to give what is true for everyone。
也不宜换做which因为any definition相当于anything的用法
如果any改成a 则可以用which

Answer 2

这句里的that is true for everyone在句中修饰definition一词,that是表示指代的作用,可以换成which但绝不能换作what,因为that和which都是句子中起到修饰某物的作用,而what意思不同。比如This is what I want. what也不能替换成that