按要求改写句子.1.Mr Lee is running very fast.（变为否定句） Mr Lee—— ————very fast.
2.The kite is flying over a tree.(变为一般疑问句,并作否定回答）
-------------------the kite-------------over a tree?
-------------,------------isn't.
3.They are flying kite.对flying kites提问.
-----------------are --------------- ------------?
4.Sam is helping the little girl.对helping the little girl提问.
----------------is-------------- ------------?