didn't have to 和don''t have to 区别

didn't have to 和don''t have to 区别 英文mustn't,don't have to,doesn't have to,didn't have to有什么区别 don"t need和don't have to 的区别? need t和don t have to的区别 don.,t have to 关于didn't have to 英语语法don't have to 与 don't need to的区别和用法don't need to和 needn' couldn't don't have to needn't的区别 need not 和 don't have to 的区别 didn't need to和和need't have done什么区别? 求救～用Have to和Don't have to造句～ didn't need to do 与needn't have done 的区别和相同点