现在进行时与过去进行时练习，求帮忙，急求对不对，先谢谢大家帮忙了

正确答案如下，你对照一下：

一、将下列句子变为否定句和一般疑问句
1. She is not having a dinner. Is she having a dinner?
2. He was not watching TV at that time. Was he watching TV at that time?
3. They are not playing football now. Are they playing football now?
4. Jack is not singing songs. Is Jack singing songs?
5. Her friend and she were not shopping. Were her friend and she shopping?
6. I am not doing my homework now. Am I doing homework now?
7. Linda is not flying a kite. Is Linda flying a kite?
8. The girls were not drinking juice at that time. Were the grils drinking juice at that time?
9. The boy was not catching fish. Was the boy catching fish?
10. The sheep is not eating grass now. Is the sheep eating grass now?

二、将下列句子变为肯定陈述句
1. They are watching a match.
2. He is driving a car.
3. They were feeding hens at 7 yesterday evening.
4. Tom was listening to music at 8 yesterday morning.
5. Jack is learning English.
6. I am spelling the word now.
7. Jim was reading a book.
8. I was dancing at that time.
9. They were teaching maths.
10. Jane is telling a story.