本文主要介绍“一般过去时”（the past tense）和“过去进行时”（the past continuous tense）两种时态。
He went to Beijing the other day. （带具体时间）
I took an English class yesterday. （带具体时间）
I was a student before 2011. （过去状态，带具体时间）
1）would、used to 与过去时
used to 表示一贯性有规律的习惯
They used to meet and would sometimes exchange one or two words. （他们过去常碰面，有时会交谈一两个字，注意would后的sometimes）
He smoked a lot two years ago. （过去的习惯）
used to 表示今昔对比的含义，叙述习惯动作，可以与would互换。
When he was a boy, he would often go there. （习惯，副词“often”）
She isn't what she used to be. （今昔对比）
Tom used to be fat.
There used to stand a tree there.
4）was/were used to +ing 表示“合适于，适用于...”
He used to work at night. （他以前经常在晚上工作，规律）
He was used to working at night. （他以前习惯晚上工作，主动）
How did you like the film ?
Could you help me ?
What were you doing at 8:30 last night ?
During that time he was going with us. （打算）
He was always changing his mind.
I was reading the book at that time. （强调参考时间段的动作）
I read the book yesterday. （陈述事实，强调结果或状态，“这本书我昨天读过了”）
It was raining all night. （优先用进行时，不过rained为持续动作，也可以用）
He was writing a letter the whole of aternoon. （持续时间状语，本句不可用一般过去时）
It was raining when he went to school yesterday. （实际上，从句是参考点）
He was reading newspaper when the train stopped.
I was brushing my teetch when my father called me.
He broke the chair while he was jumping up and down.
I was cooking the dinner while he was playing the piano. （并列）
I saw him while I was walking to the station.
注：while 和 when 刚好相反。
1，As she was reading newspaper, Granny fell asleep.
2，Tom slipped into the house when no one was looking.
3，Is Smith in America ?
Yes,he was living in China for these years.
4，The method he had stuck to was proved right.
Explaination: stick to something, stuck
5，Tom burnt his hand when he was cooking dinner.