一般过去时表示过去某个时间发生的动作或情况，包括过去的习惯性动作。常与表示过去的时间状语连用。如：a minute ago， yesterday， last week， in 1990， during the night， in those days. 用过去时时， 说“过多少时间之后”， 一般用 after， 不用in.
1.动词为实义动词时，谓语用动词的过去式，否定句在原形前加did not， 疑问句加助动词did. 如：
John suddenly fell ill yesterday.(fall-fell-fallen)
My mother didn't look well when I saw her last time.
It happened after four days. Did they go to Canada last week?
Nothing happened since then. He went out just now.(just now 刚才)
A book that cost a few jiao several years ago is worth 30 yuan now.
2.动词为be， 主语是I 或第三人称单数时，谓语用was， 其他情况用were. 如
They were classmates when they were ten years old. She was once a doctor but now she has retired .
Why were you absent from school yesterday?
3. 动词为have 时，肯定句谓语用had. 表示“有”时，否定句可用had not，疑问句将had 提至主语前面，也可与have作实义动词时相同，即否定句用didn't have， 疑问句加助动词did.如：
They didn't have any money left and they couldn't afford the house.
She didn't have any rest at noon and continued to work.
Did you have dinner with Mr. Wang at that famous restaurant the day before yesterday?
We had a big factory forty years ago.
1. John was finishing his assignments when his father _______ home from work.
A. came B. comes C. has come D. is coming
主句为过去时，状语从句也为过去时。 答案 A
2. The first zoological garden in the United States _________ in Philadelphia in 1874.(zoo)
A. had established B. has established C. was established D. established
A、D都是主动语态。 答案 C