Решение:
Используем was для единственного числа (I, he, she, it), were для множественного числа (we, you, they) и для прошедшего времени глагола 'to be' в вопросах и отрицаниях.
- A: Where were you yesterday?
- B: I wasn't at the cinema.
- A: Who were you with?
- B: I was with Kate and Billy. Where were you?
- A: I was at the library waiting for you!
- A: Were you at school this morning?
- B: Of course I was! Today is Sunday.
- A: Oh yes, you're right. Were you and your brother at the Sunday C...
- B: Yes, we were.
Ответ: 1. were, 2. wasn't, 3. were, 4. was, 5. were, 6. was, 7. Were, 8. was, 9. Were, 10. were.