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Have done是现在完成时,意思大概是一个动作以前开始做,现在还在持续着的。 Had done是过去完成时,大概意思是一个动作发生在另一个动作之前。 比如:I had left my home when my mother got up.

have/has done 现在完成时, 表示按照现在作为参考时间已经发生的事情 had done 过去完成时, 表示按照过去的某一个时间作为参考, 已经发生的事情 比如: I have been to Beijing twice. 我去过北京两次(现在正在说) I had been to Beijing twice b...

例句:He had had the computer repaired. 本来是have had sth. done已经做了某事,是have的一种典型用法,表示做过某事=have had it repaired=have repaired it这里是过去状态,就是had had了

have done 是现在完成时,表示动作在现在时间之前的完成。 had done 是过去完成时,表示动作在过去的一个时间点之前就已经完成了

你好 为你的解析如下: have had 就是你已经有了什么 比如 I have had this dictionary since I was little. have done 就是你做过什么 比如 I have made a big buzzer shot. 我曾经打球时绝杀过。 had done 就是针对于过去的过去,理解起来就是...

当然是had done,因为这是过去过去完成时态,I had done the dishes yesterday morning

had been done 表示过去的过去,是过去完成的被动态时。(当你想说发生在过去的两件事时,就要分清谁先谁后。先发生的用过去完成时,后发生的要用过去时)。 如:The rooms had been cleaned when I came. 我来的时候,房间已经被打扫了。 have/...

现在完成时 (The simple present perfect tense)是由have/has的现在式 + 过去分词构成的。规则动词的过去分词形式一般过去时相同,不规则动词则可能不同。 在英语中,现在完成时有两种用法: 1)表示开始于过去并持续到现在(也许还会持续下去...

条件状语从句对过去的虚拟结构是从句用过去完成时had done, 主语用would have done的形式,并没有从句If用 would have done的形式。 例1:If Mary had studied hard, she would have passed the final exam. 如果Mary 努力学习的话,她期末考试...

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