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.