1. The girl is singing in the classroom.(改为否定句)(改为一般疑问句)
2. They are looking for bag.(对画线部分提问)
3. I am mending my bike now.(同上)
4. There are twelve studens over there.(同上)
5. I can speak English.(改为一般疑问句)
6. I am writing now.(同上)
7. I have a desk and a chair.(用He做主语改写句子)
8. She is buying some food in the supermarket.(改为否定句)
9. I am ill. (对画线部分提问)
10. Does she like growing flowers? (给予否定回答)
11. I will make model planes with my classmates on Sunday. (对画线部分提问)
12. The girl dances beautifully.(改为感叹句)
13. The waiter and the waitress play table tennis every day.( 改为否定句)
14. The boy is standing on the man's shoulders.(改为一般疑问句)
15. It's ten o'clock.(对画线部分提问)
这我知道,其他的....