"All that" or "All what"……?

问题描述:

"All that" or "All what"……?
All what I want to do is...
还是
All that I want to do is...
语感上觉得好像是第一个>__
那想理解成主语从句呢…?如果我说:What I want to do is......是不是可以?就不可以加All了是么?All可以作定语么?

All that I want to do is...是对的.其中,all是主语,谓语是is,而that I want to do是定语从句,修饰all.all that=what,所以,What I want to do is...=All that I want to do is...,两种说法都可以....