my grandfather often goes to the park on sundays 改为否定句

my grandfather often goes to the park on sundays 改为否定句
my grandfather doesn't often go to the park on sundays.
i read english for half an hour an hour every day.主语改为mary
Mary readys english for half an hour an hour every day.
he takes a pano class once a week.用once a week提问
How often does he take a piano class?
保证准确率~