1.I playing computer.我在玩电脑.

2.I am reading an English book.我在读英语书.

4.He is playing football with his father.他在和他爸爸踢足球.

5.Listen! She is singing an English song.听，她正在唱英语歌。

7.They are reading in the library.他们正在图书馆看书.

8.He and xiaoming are playing basketball.他和小明在打篮球.

9.He is helping the teacher with his homework.他在帮老师修改作业.