don't have to,doesn't have to,didn't have to三个都是 “没有必要做” 的意思只是在时间和对象的使用上有区分；don't have to用于一般现在时的复数或对本人的叙述上,doesn't have to用于一般现在时的单数人称,而didn't have to则用于过去时中（此时不用管单复数）.
didn't have to 和don''t have to 区别
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