The Third Conditional - My English Grammar
https://myenglishgrammar.com/lessons/the-third-conditional/
WEBThe third conditional is used to describe a situation in the past that didn't happen. It expresses the hypothetical result (usually a regret, a criticism, or a suggestion) of that past unreal condition. When using the third conditional, we are imagining a different past. Examples: If I had known you were coming, I would have baked a cake.
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