1. refer to something which the speaker thinks is a possible or likely outcome?: If you're not sure when your event starts, check the programme., If there are any changes to the programme, the teachers will let you know straight away., I won't be able to go to university unless I do well in my exams at school., 2. refer to something which the speaker is imagining, or thinks is unlikely or impossible?: If I gave up football, I'd have more time to study., If I could drop some subjects, I'd have more time for geography., 0. refer to something which is generally true?: If you speak a bit of the language, it's much easier to make friends.,

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