英语共有十六种时态，其中一种是过去完成时,表示在过去的某个时间或动作以前已经发生的动作或已经存在的状态。小编在此整理了，供大家参阅，希望大家在阅读过程中有所收获!
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1.he had done something wrong.
他已经做了一些错误的。
2.he had had breakfast.
他已经吃了早饭
3.Father had done more research than I could truly appreciate until now.
父亲比我可能直到现在真实地赞赏做了更多研究。
By nine o’clock last night,we had got 200 pictures from the spaceship.
到昨晚9点钟,我们已经收到200 张飞船发来的图片.
I had been at the bus stop for 20 minutes when a bus finally came.
当车来的时候,我在车站已等了20分钟.
He said he had worked in that factory since 1949.
他说自从1949年以来他就在那家工厂工作.
Mr.Smith died yesterday.He had been a good friend of mine.
史密斯先生昨天去世了.他以前是我的好友.
I didn’t know a thing about the verbs,for I had not studied my lesson.
我对动词一无所知,因为我没有好好学习功课.
I returned the book that I had borrowed.
我已归还了我借的书.
She found the key that she had lost.
她丢失的钥匙找到了.
He said that he had known her well.
他说他很熟悉她.
I thought I had sent the letter a week before.
我认为我一星期前就把信寄出去了.
When I woke up,it had already stopped raining.
我醒来时雨已停了.
She didn’t go to bed until she had finished he work.
她直到把工作做完之后才睡觉.
六年级英语过去完成时
用法：表示在过去的某个时间或动作以前已经发生的动作或已经存在的状态。就是我们常说的：表示"过去的过去的动作或状态"。
Until then, his family _________ from him for six months.
A didn't hear C hasn't heard B hasn't been hearing D hadn't heard
全句的意思是：“到那时为止，他家里已经有六个月没得到他的消息了。”由此可以看出，谓语动词的动作延续到过去的某一时刻才完成，因此谓语要用过去完成时。答案是D。其它选项中：A didn't hear，因为一般过去时只表示过去发生的事情或存在的状态，所以不能与时间状语for six months连用。B hasn't beenhearing，现在完成进行时表示过去某时刻继续到现在或现在还在进行的动作，与题意不符。C hasn't heard，现在完成时表示从过去某一时刻到现在为止发生的动作。而题中的then只表示过去的某一时刻，不能表示现在时间。
注意事项：“过去的过去”这种逻辑关系常通过上下文体现出来，而不一定受某个时间状语的限制。
例：There had been some one in our room just now, because I noticed a burning cigarette end on the floor when we opened the front door.刚才有人在我们的房间里，因为我们打开前门进来时，我注意到地板上有一支仍在燃烧的香烟。
分析：虽然时间状语是just now，似乎应该使用一般过去时，但是“在房间里”这个状态是在"开门"和"注意"这两个过去的动作之前就存在的，所以应该用过去完成时。
