2.12
1. Is my father a worker? Yes, he is. No, he isn't.
2. Is he an engineer now? Yes, he is. No, he isn't.
3. Are these children little? Yes, they are. No, they are not.
4. Are you my best friend? Yes, you are. No, you aren't.
5. Is your daughter a pupil? Yes, she is. No, she isn't.
6. Am I a student? Yes, I am. No, I'm not.
7. Are they good boys? Yes, they are. No, they are not.
8. Is our mother a teacher? Yes, she is. No, she isn't.
2.13
1. I have no book. 2. They no good room. 3. Yes, I have. 4. Ann has a room. 5. Has she a pen? 6. Our dog is little. 7. His pencil is old. 8. Is her lamp good? 9. Give me your book, please. 10. My bag is good.
2.14
1. was
2. are
3. were
4. is
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6. is
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8. is
9. are
10. is. is
11. are
12. is
13. is
14. are
15. is
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17. are. am
18. is
19. is
(?) 20. will be
21. are