I have guitar lessons right now/twice a week/yesterdayDolphins lived/live/are living in the waterA saw/am seeing/see

1) I have guitar lessons right twice a week. 2) Dolphins live in the water. 3) I saw George last week. 4) She left an hour ago. 5) Do you meet your friends often? 6) Be quiet! We are trying to listen. 7) What did you do last weekend? 8) Does John study at the university? 9) When did Walt Disney die? 10) The boys aren\'t working on their project now.