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hAD DonE

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...

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,例如“我昨天三点到家时,露西已经睡着了”对于过去某一时刻的昨天三点,已经睡着了,也就是露西睡着时比昨天三点还早,是昨天三点的过去,...

第一个had 是指时态:had done 过去完成式 第二个had是使役动词:have sth done让某事被做(固定用法) 之所以第二个have在这里用had,是因为过去完成时的时态,要求had done所以用had had. 例:My sister had had the computer repaired. 直面...

Answer:试比较 (1)一般现在时: I buy a car today. 我今天买了一辆车.(强调的是当前的行为) (2)现在完成时: I have bought a car. 我买了一辆车.(造成的影响就是买了一辆车,并且目前正在使用中) (3)过去时: I bought a car . 我曾经买过一辆车.(...

have done 是现在完成时,表示对现在的影响 had done是过去完成时,表示过去的过去

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.

整个句子的时态不确定,表面看起来像一般过去式(你这句子貌似有点问题。。应该是He is/was/has been said to have had his car lost,整个句子时态由前面的be动词决定) 但后半部分“have had his car lost”是现在完成时。。。 have his car los...

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,比如i had done my homework yesterday 我昨天就完成作业了 这句和 i did my homewor...

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...

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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