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maryMary 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~