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have\has done 叫现在完成时。表示动作发生在过去,对现在有一定的影响。通常与时间段连用。 如:I have finished my homework. / It has rained for three days. had done 是过去完成时。表示动作发生在过去的过去。通常句中有过去时间状语作参...

【区别】have done是现在完成时,表示动作发生在过去一直延续到到现在为止(或许动作 已完成,或许动作还在进行)。 had done 是过去完成时,表示过去的过去,指过去某一时间之前就已完成的动 作。 【例句】We have lived here for ten years. 1....

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...

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.

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

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...

was done was done是一般过去时的被动语态was/were done之一。英语分为主要的八大时态,两大语态。其中,一般过去时即谓语动词为过去式,表示一个过去发生的动作,而被动语态是表示主语被怎样,其中主语是动作的被执行者即动作承受着。二者匹配...

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/...

had been done过去某个时间之前已经被做、被完成 had been doing过去某个时间之前已经在做或者继续在做 had be done是错的。时态和语态多不对。 had being done也是错误的。时态和语态都不对。 had纯粹的过去动作。

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

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