Imagined, wished for or unlikely situations are considered ‘unreal’ time. When we are talking about these situations, we often shift the verb form backwards. For example, the present changes to the past, and the past
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We use the third conditional to talk about imagined past events: things that might have happened in the past, but didn’t happen.
We use the second conditional in English when we want to talk about unreal situations or things we don’t think will happen. We use it to talk about the possible results of these situations.