To или be it … a shake

Привет! Давай решим это задание вместе. Нужно вставить правильную форму глагола "to be".

1. It is a snake.
2. They are dolphins.
3. They are oranges.
4. You are a doctor.
5. I am a mouse.
6. She is a horse.
7. You are a doctor.
8. It is a boy.
9. They are students.
10. He is a teacher.
11. Ann and Mary are classmates.
12. He is eleven.
13. She is a student.
14. It is a piano.
15. He is Greek.
16. Susan is twenty.
17. My mother is an engineer.
18. We are from London.
19. It is a radio.
20. She is a woman.
21. They are boys and girls.
22. We are from Russia.
23. He is a policeman.

Если что-то непонятно, спрашивай!