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 …
关注. had done是过去完成时，如果动作发生在相对于过去某一时刻的过去，在过去某时刻已经完成了，就用had done。. have/has done是现在完成时，是相对于 …
Could have, would have, and should have are sometimes called “modals of lost opportunities”. Both your sentences are incorrect (never use has or had to form …
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