Решение:
- I was very tired. (Местоимение 'I' требует глагол 'was').
- She was absent yesterday. (Местоимение 'She' требует глагол 'was').
- They were in the park. (Местоимение 'They' требует глагол 'were').
- He was my teacher. (Местоимение 'He' требует глагол 'was').
- We were excited. (Местоимение 'We' требует глагол 'were').
- It was a sunny day. (Местоимение 'It' требует глагол 'was').
- The boys were playing. (Существительное 'The boys' во множественном числе требует глагол 'were').
- You were right. (Местоимение 'You' требует глагол 'were').
- The girl was happy. (Существительное 'The girl' в единственном числе требует глагол 'was').
- The cows were in the field. (Существительное 'The cows' во множественном числе требует глагол 'were').
Ответ: 1. was; 2. was; 3. were; 4. was; 5. were; 6. was; 7. were; 8. were; 9. was; 10. were.