2. Поставьте следующие предложения во множественное число. 1. This is a star. 2. This is a boy. 3. This is a baby. 4. That is a plate. 5. That is a flower. 6. That is a bookshelf. 7. Is this a sofa? 8. Is this a bookcase? 9. Is this a man? 10. Is that a ball? 11. Is that a train? 12. Is that a plane? 13. Is the window open? 14. Is the door closed? 15. Is the boy near the window? 16. That is not a king, 17. That is not a queen. 18. That is not a bus. 19. This isn't a mountain. 20. That isn't a goose. 21. This isn't a mouse. 22. It is a sheep.

ответ:
1. These are stars.
2. These are boys.
3. These are babies
4. Those are plates
5. Those are flowers
6. Those are bookshelves
7. Are these sofas?
8. Are these bookcases?
9. Are these men?
10. These are balls?
11. Those are trains?
12. Those are planes?
13. Are the windows open?
14. Are the doors closed?
15. Are the boys near the window?
16. Those are not kings
17. Those are not queens
18. Those are not buses
19. These aren't mountains
20. Those aren't geese
21. These aren't mice
22. They are sheeps
23. These are cigarettes
24. They are big cats
25. They are not girls
26. These aren't bags
27. These aren't trees
28. These are not bad eggs
29. These are good eggs
30. Are those flowers?

Объяснение:
This (ед.ч.) -> These
That (ед.ч.) -> Those
It (ед.ч.) -> They / These / Those

There are a stars

They are a boys

They are a babies

Thats a plates

Thats a flowers.

That a bookshelf.

Arent this a sofas?

Is thats a bookcases?

Is they are men?

Is that a balls?

11. Is that a train?-Is that are trains?-Я не знаю что точно, ибо в русском языке не бывает что то по типу "Это что, тренировки?". Я больше склоняюсь ко второму варианту, но и вы подумайте

дальше я не знаю, простите, удачи вам!