如何正确理解 had done、have done、have been doing 这 3 ...

比如针对 had done,我们可以按照 (1) 是否是进行体、 (2) 是否是完成体、 (3) 是什么时的顺序分析为: (1) 不包含 be doing → 非进行、 (2) 包含 have done → 完成 …

have done 是从过去发生,截止到现在,比如i have done my homework,我已经写完作业了. ,表示我现在不用写作业了. 而had done 是过去的过去发生,截止到过去, …

0. I "have done" is present perfect while I "had done" is past perfect. What these tell us is when the action was completed (made perfect/perfected). So, "I have …

英语中had had done表示的意思是在过去的某一时间之前某事已经被做。. 此为 过去完成时 态。. 在这里,第一个had 是指时态:had done 过去完成式第二个had是 使 …

这句话应该这么理解:他让人修理的电视机现在正常了。. 也就是he has had the TV set repaired,这里的has had 是 have sth done的现在完成时态,然后变成定语从 …

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