一、1.Have you flown a kite?你放风筝吗?
2.Have you sat in the boat?你坐过这条小船吗?
3.Is he talking with me?他是在跟我说话吗?
4.We are playing football now.我们正在踢足球.
5.I will sing an English song.我要唱一首英语歌曲.
6.My mother is cooking in the kitchen.我妈妈正在厨房做饭.
7.Is the boy writing a letter?那个男孩在写信吗?
8.We can't help you because we are having classes.我们不能帮你是因为我们正在上课.
二、1.She is opening the window now.
2.否定句：Tom isn't closing the door now.
疑问句：Is Tom closing the door now?-No,he isn't.
3.否定句：I'm not looking after the baby.
疑问句：Are you looking after the baby?- No,I'm not.
4.否定：She isn't singing in the class.
疑问：Is she singing in the class?-No,she isn't.
5.They are singing under the tree now.