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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.​