King Streeta year ago.

　　2.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 Streeta year ago?

　　King Streeta year ago?

　　3.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 Streeta year ago.

　　King Streeta year ago.

　　4.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.