Ex3/
1. There's a big TV.
2. There are four new cars.
3. There are green fields.
4. Are there two big pizzas?
5. There is new DVD player.
6. Hanoi is a beautiful city.
7. Mai is a new student.
8. He is a good friend.
9. There is a bed in the corner of the room.
10. There are some pictures on the wall.
Ex5/
1. are
2. do
3. are
4. does
5. Do
6. isn't
7. aren't
8. do