Ex. 1. Вставь нужную форму глагола to be.

Решение:

Нужно вставить правильную форму глагола 'to be' (am, is, are) в каждом предложении, учитывая подлежащее.

1. She is a girl. (She - ед. ч., 3 л. -> is)
2. I am a pupil of the fifth form. (I - 1 л. ед. ч. -> am)
3. They are in the classroom. (They - мн. ч. -> are)
4. It is a book. (It - ед. ч., 3 л. -> is)
5. John is from New York. (John - ед. ч., 3 л. -> is)
6. The sun is very hot. (The sun - ед. ч., 3 л. -> is)
7. I am happy. (I - 1 л. ед. ч. -> am)
8. She is from China. (She - ед. ч., 3 л. -> is)
9. Mary is a nice girl. (Mary - ед. ч., 3 л. -> is)
10. John is a student. (John - ед. ч., 3 л. -> is)
11. My flat is very big. (My flat - ед. ч., 3 л. -> is)
12. Mary and Helen are in the park. (Mary and Helen - мн. ч. -> are)
13. The sky is blue. (The sky - ед. ч., 3 л. -> is)
14. These flowers are very beautiful. (These flowers - мн. ч. -> are)
15. The apples are on the table. (The apples - мн. ч. -> are)

Ответ: 1. is, 2. am, 3. are, 4. is, 5. is, 6. is, 7. am, 8. is, 9. is, 10. is, 11. is, 12. are, 13. is, 14. are, 15. are.