Exercise 13. Put the verb to be in the plural and change the sentence accordingly:
1. We are always glad to see them.
2. When are they free? They are free in the evenings.
3. They are so happy!
4. When are they at home? They are at home in the mornings.
5. Who are ill? Our mothers are.
6. Are you hungry? No, we are not.
7. Are your sisters at school? No, they aren't. They aren't at school.
8. Who are away? - Petrovs are away.
9. Are we right? Yes, you are.
10. How are you? -- We are quite well, thank you.
11. Are you tired? Yes, we are.
12. There are woman in the rooms.
13. Who are absent? Ivanovs are.
14. We are thirsty.
15. They are wrong.