1. He is walking.
2. They are talking.
3. I am reading.
4. She is writing.
5. You are jumping.
6. We are making a sandcastle.
7. I am driving a car.
8. She is painting a picture.
9. You are playing the pian.
10. They are watching TV.
11. He is singing a song.
12. We are dancing.
Какой глагол поставить — am, is или are — зависит от местоимения, с которым оно используется. С местоимением I используется am. С местоимениями he, she, it используется is, а со всеми остальными — you, we, they — используется are.