Bài 1
1- His sister is skipping
2- Lan's father is working in the garden
3- Nam and Ba are playing volleyball
4- Students are playing soccer
Bài 2
1- is ... doing ; is playing ( do có từ now)
2- are ... you ; am going ( do có từ now)
3- does ... playing ; plays( do nói chung)
4- plays ( do nói chung)
5- eats ; is eating (từ 1 có often ; từ 2 có at the moment)
8- does ; is playing