1.They do their housework on Saturdays.
Do they do their housework on Saturdays?
Yes,they do .
No, they don't .
.2.His grandmother washes the dishes after supper
.Does his grandmother wash the dishes after supper?
Yes, she does.
No , she doesn't .
把下面两个句子变成否定句、一般疑问句并做肯定和否定回答