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@Nhy

23 . If we lived without air , we would die

24 . If she hadn't had a visa , she couldn't have come to that country

25 . If there weren't the sun , man would live in the darkness

26 . It he hadn't had money , he wouldn't have bought such a big house

27 . If he didn't smoke , he wouldn't be so weak

28 . If it hadn't been cold yesterday , we could have gone swimming

29 . If it weren't very cold , we could go swimming

30 . If I hadn't been busy , I would have watched TV last night