1.He usually (watch) watchs TV but sometimes he (read) reads book.
2.We (not go) don't go to the zoo very often.
3.Lan and Phong (be) are in the kitchen. They (cook) cook dinner.
4.What about (play) playing soccer this after school?
5.My sister (be) is in the garden.She (water) water the flowers.
6.Be quiet! I (study) am studying.
7.Look! the plane (fly) is flying toward the airport.
8.We'll go out when the rain (stop) stops.
9.I (stay) will stay here until he (answer) answers me.
10.Listen ! Birds (sing) are singing.
11. When I was a child, I used to (study) study hard.