Помогите с упражнением по английскому , пожалуйста . Хотя бы некоторые предложения

1. had arrived 2. had left 3. had seen 4. had built 5. had graduated 6. has to be ready 7. had learnt 8. will have seen 9. who will have prepared 10. hadn't worked 11. had taken a part 12. will have spent