一般过去时：表示过去发生的动作或事件， 常和表示过去的时间状语连用，如yesterday, last night, the day before yesterday, 3 days ago,
含有be动词的句子， 将动词变为过去式，am, is的过去式为was，are的过去式为were
I was at the butcher’s.
You were a student a year ago.
The teacher was very beautiful ten years ago.
Were you at the butcher’s?
Were you a student a year ago?
Was the teacher very beautiful ten years ago?
I was not at the butcher’s.
You were not a student a year ago.
The teacher was not very beautiful ten years ago.
Yes, I was. No, I was not.
Yes, you were. No, you were not.
Yes, he/she was. No, he/she was not.
What did you do?
I finished my homework yesterday.
The boy went to a restaurant.
The Sawyers lived at King Streeta year ago.
Did you finish your homework yesterday?
Did the boy go to a restaurant?
Did the Sawyers live at King Streeta year ago?
I did not finish my homework yesterday.
The boy did not go to a restaurant.
The Sawyers did not live at King Streeta year ago.
Yes, I did. No, I didn’t.
Yes, he did. No, he didn’t.
Yes, they did. No, they did not.