Brother reads a book.mother cooks a cake.в отрицательной форме,вопросительной,да,нет(например: i go to school,i do not go to school,do i go to school? да.yes i do,нет,no i don"t) ! !

Brother doesn't read a book.
Does read brother a book? yes, he does
no, he doesn't
Mother doesn't cook a cake
Does cook mother a cake ? Yes ,she does
No, she doesn't