shoule ought had better have to must的区别

问题描述:

shoule ought had better have to must的区别
用法以及表达意思

should do sth.
must do sth.
ought to do sth.
前三个都是必须做某事,语气较直接.
had better do sth.最好做某事,委婉一些的说法.
have to do sth.表示不得不做某事,有不情愿的意思在里面.