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  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.

  ★变疑问句将be动词移动到句首

  Were you at the butcher’s?

  Were you a student a year ago?

  Was the teacher very beautiful ten years ago?

  ★变否定句在be动词后面加not

  I was not at the butcher’s.

  You were not a student a year ago.

  The teacher was not very beautiful ten years ago.

  ★肯定回答否定回答

  Yes, I was. No, I was not.

  Yes, you were. No, you were not.

  Yes, he/she was. No, he/she was not.

  ★特殊疑问句：

  What did you do?

  (必背)

  不含有be动词的句子，将动词变为过去式

  I finished my homework yesterday.

  The boy went to a restaurant.

  The Sawyers lived at King Street a year ago.

  ★变疑问句在句首加did， 动词变为原型

  Did you finish your homework yesterday?

  Did the boy go to a restaurant?

  Did the Sawyers live at King Street a year ago?

  ★变否定句在主语和动词之间加did not

  I did not finish my homework yesterday.

  The boy did not go to a restaurant.

  The Sawyers did not live at King Street a year ago.

  ★肯定回答及否定回答

  Yes, I did. No, I didn’t.

  Yes, he did. No, he didn’t.

  Yes, they did. No, they did not.