英文mustn't,don't have to,doesn't have to,didn't have to有什么区别

英文mustn't,don't have to,doesn't have to,didn't have to有什么区别 didn't have to 和don''t have to 区别 must 和 have to 有什么不一样?mustn't 和 don't have有什么不一样? don.,t have to can,can't,must,mustn't,needn't,be allowed to,have to,don't h 关于didn't have to couldn't don't have to needn't的区别 must 和 have to 的异同?mustn't 和 don't have to 的异同? can/can`t/must/mustn`t/need/needn`t/have to/到底有什么区别?如题 谢谢了 needn't和don't need to有什么区别?haven't和 don't have 有 don"t need和don't have to 的区别? 请教几个英语知识1.mustn't musn't to haven't to don't have to 2.pass和