Следующие предложения во множественное число. 1. this is a bird. 2. is that also a bird? - no, it isn't. that is a cat. 3. is that a good horse? - yes, it is. 4. is that cow big or small? - it is big. 5. this is an apple and that is a flower. 6. is that cow big or small? - it is big. 5. this is an apple and that is a flower. 6. where is the coin? - it is in the£ box. 7. what colour is the box? - it is green. 8. what is it made of? - it is made of wood. 9. what is that man? - he is a clerk. 10. is he in the office? - yes, he is. 11. is that woman a typist? - no, she isn't. - what is she? - she is a doctor. 12. is his brother at home? -yes, he is. 13. this house has a balcony looking out on the street. 14. the architecture of this building is quite modern. 15. this is a new district of st. petersburg. 16 there is a shop, a cinema and a theatre in the new district. 17. he is a retired worker. 18. i am a doctor. 19. we hear the sounds of a child's voice. 20. she is a nice girl.

1. These are birds. 2. Are those also birds? - No, they aren't. Those are cats. 3. Are those good horses? - Yes, they are. 4. Are those cows big or small? - They are big. 5. These are apples and those are flowers. 6. Where are the coins? - they are in the box. 7. What colour are the boxes? - They are green. 8. What are they made of? - They are made of wood. 9. What are those men? - They are clerks. 10. Are they in the office? - Yes, they are. 11. Are those women typists? - No, they aren't. - What are they? - They are doctors. 12. Are his brothers at home? -Yes, they are. 13. These houses have a balcony looking out on the street. 14. The architecture of these buildings is quite modern. 15. These are new districts of St. Petersburg. 16 There are shops, cinemas and theatres in the new district. 17. They are retired workers. 18. We are doctors. 19. We hear the sounds of children's voices. 20. They are nice girls.

В №14 не совсем понятно что ставить во множественное число. Думаю, здесь есть подвох, т.к. архитектура, как неисчисляемое, может стоять только в единственном числе. Поэтому поменяла единстенно возможное - "здание".