could had done是什么时态

could had done是过去完成时，表示动作发生在过去的过去；

对过去的某一点造成的某种影响或是结果，用来指在另一个过去行动之前就已经完成了的事件；

在英语时态中，“时“指动作发生的时间，”态“指动作的样子和状态。 它表示动作发生的时间是“过去的过去”，侧重事情的结果。

It wasn\'t perfect, but it was good and I could tell he had done his best.

文章不算完美，但很好，可以看出他是尽全力了。

You could argue he had done it to curry favor from the guards, or make a few friends among us cons.

你可能会说安迪这么做是为了讨好狱警们，或跟他的狱友们套近乎。

I could see he had not done it before, because he almost fell on his face, having only one leg.

可以看得出他之前从未这样做过，现在只有一条腿的他差点扑倒在地。但我没打算帮他。

I asked him whether he had done it all himself or whether someone had helped him.

我问过他这都是他自己做的还是有人帮他做的。

The director paid tribute to all she had done for the charity.

董事赞扬她为慈善事业所做的一切。