have/has to(必须）的否定是借助助动词还是直接加not
问题描述：
have/has to(必须）的否定是借助助动词还是直接加not
答
借助助动词 do: don't/doesn't have to
答
是don't have to(没必要）
答
是don't have to
doesn't have to
只有在完成时中,has/have能加not
答
haven't to
hasn't to