the boy did his homework yesterday改为否定句

the boy did his homework yesterday改为否定句 the boy ___ finish his homework yesterday 否定句 Mary did homework yesterday.改为否定句 He did his homework at home yesterday.(改为否定句） Ben did his homework after school yesterday.(改为否定句） he did his homework after school yesterday.变否定句 tom did his homework yesterday改否定句 she did her homework yesterday evening (改为否定句） I did my homework yesterday evening.改为否定句 lucy did her homework yesterday 改为否定句 He finished his homework yesterday afternoon （改为否定句） 改为否定句：The boy does his homework on his own.改成否定句的时候是doesn't