1.I often ___________(exercise) ,but my sister never ____________(exercise).(用正确形式填空)
2.I exercise three times a day.(变为否定句) I __________ _________ three times a day
3.She exercises twice a week.(变为一般疑问句)__________ _________exercise twice a week?
4.I play the trumpet on weekends.(用he改写句子)
He ________ ________ _________ on weekends?