细叶铁皇冠造景:谁来跟我讲一下过去完成进行时的问题

过去完成时使用在表示“过去某个时间之前完成的动作”，也就是“过去的过去”。昨天以前一直在睡觉：had been sleeping
painter who had been working on the tower 画家一直在塔上作画，受理拿着一桶颜料 进行时都表持续

"worked"是一般过去时的用法．
”had been doing"是过去完成进行时的用法，主要表示动作在过去某一时间之前开始，一直延续到这一过去时间，必须以一过去时间为前提．
例如：
I had been looking for it for days before I found it .
(这个东西，我找了好多天才找着．）

过去完成时

1） 概念：表示过去的过去
----|-------|-----|---->其构成是had +过去分词构成。
那时以前 那时 现在

2） 用法
a. 在told, said, knew, heard, thought等动词后的宾语从句。
She said (that) she had never been to Paris.
b. 状语从句
在过去不同时间发生的两个动作中，发生在先，用过去完成时；发生在后，用一般过去时。
When the police arrived, the thieves had run away.
c. 表示意向的动词，如hope, wish, expect, think, intend, mean, suppose等，用过去完成时表示"原本…，未能…"
We had hoped that you would come, but you didn't.

3) 过去完成时的时间状语before, by, until , when, after, once, as soon as。
He said that he had learned some English before.
By the time he was twelve, Edison had began to make a living by himself.
Tom was disappointed that most of the guests had left when he arrived at the party.

典型例题
The students ___ busily when Miss Brown went to get a book she ___ in the office.
A. had written, left B，were writing, has left C. had written, had left D. were writing, had left
答案D. "把书忘在办公室"发生在"去取书"这一过去的动作之前，因此"忘了书"这一动作发生在过去的过去，用过去完成时。句中when表示的是时间的一点，表示在"同学们正忙于……"这一背景下，when所引导的动作发生。因此
前一句应用过去进行时。

注意： had no … when 还没等…… 就……
had no sooner… than 刚…… 就……
He had no sooner bought the car than he sold it.

比说你想表达:雨从昨天一直下到现在.
你不能说成:it's raining
也把能说成:it has rained
也不能说成:it rains
也不能说成:it rained
能表达上面那个意思,就要用到完成进行时了.
it has been raining for 2 days.

A painter who had been working on the tower hung a pot of paint on one of the hands.
had been working 这里指画家一直在工作...
worked 指他过去工作
had worked 指工作完成了,现在没有工作了..

had+been+doing 表示过去一直进行的动作，是强调持续性的。
比如，I had been working for all day long yesterday.
意思就是我昨天一直工作一天，而过去式一般不做强调持续性。
也许是选择题容易出这样的问题，要你区别这两种，一般来讲都是可以看到标志的，例如刚才那句的for all day long 就是个提示，表示持续一直。

这种东西时间久了题目做多了你就知道了。初是碰到不要心急，慢慢你就会懂的。