用所给词的正确形式填空。
1.Listen! Someone ______ (sing) in the music room.
2.Why ______ (do) they like running?
3.He ______ (not like) playing basketball. He ______ (like) playing tennis.
4.She sometimes ______ (go) to school on foot.
5.My hobby is skating. Is skating ______ (you) hobby?
6.I often help my mum ______ (clean) the windows on Sundays.