英语中的一般过去时和过去完成时怎么区分？

这两种时态学生很容易混淆，因为它们据描述的动作都是过去发生的。那么我们应当怎么去区别开它们呢？
它们的主要区别在于：一般过去时一般只出现一个表过去的时间，而过去完成时则应出现两个表过去的、有先后时间或动作！
1. 一般过去时表示说话人关心过去某动作发生的“时间”，所以往往有表过去的时间！如有two days ago, last week, yesterday等等。
He came here two years ago.
We played basketball last week.
2.过去完成时则主要体现过去发生的两动作的先后有别，表达的是“过去的过去”，即比过去发生的某动作都还要“过去”，两动作中先发生的就用过去完成时，后发生的则只用一般过去时。运用过去完成时的句子往往有两过去的时间或动作，一定要注意这点哟！
Mr Green had lived in New York for ten years before he came to China.("来”中国已过去，而先前“住”在纽约更过去！)
We had learned 1000 words by the end of last term.
（“上期期末”已过去，而是在其前“学”的就更过去了！）

1）在确定的过去时间里所发生的动作或存在的状态。
时间状语有：yesterday, last week, an hour ago, the other day, in 1982等。
Where did you go just now?

2）表示在过去一段时间内，经常性或习惯性的动作。
When I was a child, I often played football in the street.
Whenever the Browns went during their visit, they were given a warm welcome.

3）句型：
It is time for sb. to do sth "到……时间了" "该……了"
It is time sb. did sth. "时间已迟了" "早该……了"
It is time for you to go to bed. 你该睡觉了。
It is time you went to bed. 你早该睡觉了。
would (had) rather sb. did sth. 表示'宁愿某人做某事'
I'd rather you came tomorrow.

4) wish, wonder, think, hope 等用过去时，作试探性的询问、请求、建议等。
I thought you might have some. 我以为你想要一些。

比较：
一般过去时表示的动作或状态都已成为过去，现已不复存在。
Christine was an invalid all her life.
(含义：她已不在人间。)
Christine has been an invalid all her life.
(含义：她现在还活着)
Mrs. Darby lived in Kentucky for seven years.
(含义：达比太太已不再住在肯塔基州。)
Mrs. Darby has lived in Kentucky for seven years.
( 含义：现在还住在肯塔基州，有可能指刚离去)

注意： 用过去时表示现在，表示委婉语气。
1）动词want, hope, wonder, think, intend 等。
Did you want anything else?
I wondered if you could help me.
2）情态动词 could, would.
Could you lend me your bike?

后者是过去的过去