"He did his homework."改为疑问句,老师给的答案是：Did he do his homework?可我觉得“do”的后面不应该加上es吗？“he"是三单啊！

He did his homework at school. After supper he did his homework.Hw ( ) supper.( )he did his homework. his mother was .because he did not finish his homework He did his homework at eight last night.对did his homework 提问. What （）he do yesterday?He did his homework yesterday. he has 承认 that he did not finish his homework He did his homework last night.(改为否定句) He did his homework last night.(改成否定句） he did his homework just nom 变成一般疑问句 he did his homework after school yesterday.变否定句 He did his homework last night.用 at night 改写 He often did his homework after school对不对 he did his homework in th classroom.（否定句） After supper he did his homework.Hw ( ) s 改英语复合句He did his homework before supper He did his homework just now.(改为否定句） He ___ ___his homework just now. He did his homework at home yesterday.(改为否定句）He ______ _______ his homework at home yesterdat. He went to bed after he did his homework.改为同义句 He 空 go to bed 空 he did his homework.