mustn't mustn't to haven't to don't haven't to

问题描述:

mustn't mustn't to haven't to don't haven't to

mustn't 是很强烈的语气,表"不准,禁止"
没有 mustn't to 这种用法
have to 是客观原因 "不得不,必须" 一般不存在用haven't to 表否定,多用don't have to 没必要.

mustn't 禁止
没有mustn't to,要把to去掉
后两项应该把n't去掉