Ответ:
1. he, she, it, we или they?
(§6)
1. a chair — they
2. a cat — it
3. my mother — she
4. his mother — she
5. mothers — they
6. my mother and I — we
7. Alla and I — we
8. Alla and Anton — they
9. a bird — it
10. birds — they
(§6)
1. a chair — they
2. a cat — it
3. my mother — she
4. his mother — she
5. mothers — they
6. my mother and I — we
7. Alla and I — we
8. Alla and Anton — they
9. a bird — it
10. birds — they