“过去式”表明以往产生的姿势或恶性事件， 常和表明以往的时间状语并用，如yesterday, last night, the day before yesterday, 3 days ago,带有be动词的语句， 将形容词变成过去式，am, is的过去式为was，are的过去式为wereI 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动词挪动到句首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动词后边加notI was not at the butcher’s.You were not a student a year ago.The teacher was not very beautiful ten years ago.★毫无疑问回应否定回答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)不带有be动词的语句，将形容词变成过去式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， 形容词变成原形Did you finish your homework yesterday?Did the boy go to a restaurant?Did the Sawyers live at King Street a year ago?★变否定句在主语和形容词中间加did notI 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.★毫无疑问回应及否定回答Yes, I did. No, I didn’t.Yes, he did. No, he didn’t.Yes, they did. No, they did not.