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Ответ:

18 would have seen

19 have

20 hadn't hidden

21 were

22 told

23 would have arrived

24 had listened

25 would have been

26 would have made

Объяснение:

18,20,23,24,25,26 Conditional III -в придаточной части Past Perfect, в главной части would+ have+V3/Ved

19 Conditional I в придаточной части Present Simple

21,22 Conditional II в придаточной Past Simple,в главной - would +V1