have/has to(必须)的否定是借助助动词还是直接加not

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have/has to(必须)的否定是借助助动词还是直接加not

是don't have to
doesn't have to
只有在完成时中,has/have能加not

haven't to
hasn't to

是don't have to(没必要)

借助助动词 do: don't/doesn't have to