1.want sb to do sth 否定形式?

题目

1.want sb to do sth 否定形式?
2.help sb do sth 的否定形式又 是什么?
3.
好像动词不定式否定 是 在不定式之前加not,构成not to do sth.
如：tell sb not to do sth
但 want to do sth 就是直接用 don't want to do sth
怎么回事?

答案

want to do sth 直接用 don't want to do sth 这里的不定式是做宾语的tell sb not to do sth 这里的不定式是做宾语补足语的!结构不同.实例：I don't want to do that. I want him not to do that.当然第二句也...