ought to,had better,have to的否定形式,给几个例句;had better后必须加动原吗?一定要给例句.

问题描述:

ought to,had better,have to的否定形式,给几个例句;had better后必须加动原吗?
一定要给例句.

had betternot do sth dont have to do sth 是的