III. Find and correct the mistakes:
1. I'm twenty-one years old and I'm a worker.
2. She and he go to work on foot.
3. That's my sister over there. She is standing next to the window.
4. Let's go shopping!
5. My friends don't like watching TV after school.
6. He is the taller of the two boys.
7. There is a big eraser on the desk.
8. We don't understand what you are saying.
9. How many men are there in the room?
10. We can't go out because it is raining.