must的否定是否等于don't have to
must的否定是否等于don't have to
must的否定?must的否定是need't还是don't have to?
以must 开头的疑问句,否定回答是 needn't,don't have to可以吗?
请问must的一般疑问句的否定回答可以是:No,I don't have to
be have to是否等于must to
must 和 have to 的异同?mustn't 和 don't have to 的异同?
don't have to do sth 是否等于don't need to do sth 和needn't do st
请问have not是否等于don't have
don't have to等于什么
can,can't,must,mustn't,needn't,be allowed to,have to,don't h
don't have to 是肯定还是否定?
关于have to/must be与don't have to/can't be