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20. If the weather (to be) fine, we (to be able) to go to the forest.
21. (to book) a return ticket yesterday if he (to have) an opportunity
22. If she (to return) home before Friday, she (to help) us to do the translation.
23. if t (to finish) the work last week, (to have) long vacation.
24. I (to miss) the train if I (not to take) a taxi.
25. If Tom (to have) a spare ticket, his friends (to take) him to the concert.
ответ: 20. is fine..will be able
21. He should have booked ...had had an opportunity
22. returns ..will help
23. had finished..woulad have had
24. will miss..don’t take ..
25 has ..will take
Объяснение: