don’t have；haven’t和need的用法

来源：学生作业帮编辑：作业帮分类：综合作业时间：2024/05/17 05:56:06

don’t have；haven’t和need的用法
是不是当have+done组成现在完成时时才用haven’t+done?这时第三人称单数是不是要变成hasn’t+done,过去式是不是要变成hadn’t+done?
是不是当have+to do或是have+sth时就用don’t have?这个时侯第三人称单数是不是要变成doesn’t have?过去式是不是要变成hadn’t have?
它和need的用法有什么区别么?我记得need+do好像是没有时态变化和人称变化的.否定形式就是needn't do.need+sth或者need+to do第三人称好像是needs to do/sth..是有时态变化的..
..我知道我的问题很邪门..= =...

问题1.“过去式是不是要变成hadn’t+done?”
貌似过去完成时?
这里用的是助动词用法,就像 can-> cannot 一样,不能变成don't can
问题2.have to do -> don't have to do 或者是 don't need to do 都可以.
这里是实义动词.
问题3.need + do = 问题1,所以变为needn't .need to do = 问题2,所以变为 don't need to do
补充一句,你的问题不邪门,只不过,我觉得是你的学习顺序有点邪门...

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