Use the Third Conditional to talk about past situations that didn't happen — imagining a different past.
If + Past Perfect, ... would have + past participle. Example: If I had studied, I would have passed.
Describes something that didn't actually happen — looking back with regret or speculation.
Could have / might have can replace would have. Example: If he had called, I could have helped.
'would have' is often contracted to 'would've' in speech and informal writing.
If + Past Perfect, ... would have + past participle. Example: If I had studied, I would have passed.Describes something that didn't actually happen — looking back with regret or speculation.'would have' is often contracted to 'would've' in speech and informal writing.Could have / might have can replace would have. Example: If he had called, I could have helped.