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Привет! Давай разберёмся с упражнением. Тебе нужно вставить правильные формы глаголов "to be" в предложения. Давай пройдём по каждому предложению:

1. They were in France now.
2. They were in France last week.
3. Mr Brown is in his office yesterday. (правильно будет "was")
4. Mr Brown will be in his office tomorrow.
5. Caroline will be here tomorrow.
6. Caroline was on holiday two months ago.
7. My sister was on holiday now. (правильно будет "is")
8. My sister was always late for work last Monday.
9. My sister will be at the party next Monday.
10. Nuray and Fidan are at the party last weekend. (правильно будет "were")
11. The weather is very cold yesterday. (правильно будет "was")
12. The weather will be very cold tomorrow.
13. The weather is very good yesterday. (правильно будет "was")
14. The weather was very good today.
15. Nuray's birthday is in the 8th grade now. (не совсем корректно, если имеется в виду "было")
16. The 8th grade will be two years ago. (некорректно, лучше использовать "was")
17. My studies will be in the 8th grade next year. (похоже на "will be")
18. My favourite subject is Geography two years ago. (правильно будет "was")
19. My favourite subject is Geography now.
20. My favourite subject is not in the United Kingdom last year. (правильно будет "was")
21. I was thirteen years old two years ago.
22. I am thirteen years old today.
23. I will be thirteen years old in four years.
24. I was born in the United Kingdom on holiday.
25. My sister and I were in the United Kingdom now. (правильно будет "are")
26. My sister and I were in the United Kingdom today. (правильно)
27. My sister and I were in the United Kingdom now. (правильно будет "are")

Удачи с обучением! Если есть вопросы, спрашивай.