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..

Zero, first or second?

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