I had done ,I have done ,I am done有何区别完成时,过去分词等全部都没学

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• I had done ,I have done ,I am done有何区别完成时,过去分词等全部都没学
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• I had done ,I have done ,I am done有何区别
• intend的用法咋那么多 我都分不清1.intend to have done 本想做而没做2.had intended to do sth.本打算做某事书上写有这两点,可我都无法分清有什么区别.请大家帮我说说.还有一道题：You have made a mistake again .sorry ,but I ( )to.A.had not intended B.haven't intended C.didn't intend A 翻译出来不是说 “本不打算”吗B 用现在完成时 问句也是现完 不就正好对上了吗 对现在有影响
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