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if + past perfect, ...would + have + past participle

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We can use it to talk about things in the future that are probably not going to be true. like imagining some dream for example.

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It talks about the past. It's used to describe a situation that didn't happen, and to imagine the result of this situation.

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And that is the  way we imagine how things could have been different in the past.

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to talk about something in the past that did not happen.

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unreal (impossible) or improbable situation