Ex7: Đổi các câu sang dạng số nhiều :
1. Her chair is old.
2. What color is this flower?
3. There is a garden behind the house.
4. Is your pen new or old?
5. What's that? -It's an eraser.
6. The house is small.
7. There is a picture on the wall.
8. Where is the pencil? -It's on the desk.
9. What's that? -It's a truck.