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Welcome to BBC Learning English. I'm Sam and today we are talking about the third conditional.

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The third conditional is a little strange because we're talking about something that didn't happen

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in the past. Why would we do that? Well because sometimes we want to imagine a different outcome.

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A friend of mine came to visit me yesterday. It was a surprise so when I opened my front door I

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said if I'd known you were coming I would have baked a cake did I know she

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was coming no did I bake a cake no so I'm imagining a different result because

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we're talking about an imaginary past we use if plus the subject plus the past

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perfect and then the subject plus would have plus past participle and you can

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also swap those around. What would you have done if you'd known your friend was coming?