★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.