Помогите никак не додумаюсь, буду благодарна!

1. There is gas in their house.

2. The computer is very good.

3. It is a very clever dog.

4. She is crying.

5. My sister is making a cake now.

6. They are swimming now.

7. He is playing the piano now.

8. Listen! Nelly is crying. - No, she isn't crying. She is laughing.

9. I think that they will come.

10. I am thinking about our plans.