i've read all the books you gave me

问题描述:

i've read all the books you gave me
i've read all the books what you gave me.
为什么只能用what而不能用that?它们有什么区别

这里的what=all that
但是你这句话是错的,应该是
i've read all the books that you gave me

i've read what you gave me
what 代替了all the books 做gave 的直接宾语