Third Conditional

The third conditional talks about imaginary situations in the past. We use it to speculate about how things could have been different, to express regret, or to criticise past decisions. The situation did NOT happen — we are imagining an alternative past.

• • Structure: If + past perfect, would have + past participle
• • "Would have" can be contracted: I'd have, she'd have, they'd have.
• • Other modals can replace "would": could have, might have, should have.
• • The if-clause and main clause can be swapped: "I would have passed if I had studied harder."
• • The third conditional is impossible to make real — the past cannot be changed.

1. 1

   Imagining a different past outcome

   If he had left earlier, he would have arrived on time.

2. 2

   Expressing regret about the past

   If I had saved more money, I would have bought that house.

3. 3

   Criticising past decisions

   If you had listened to me, this wouldn't have happened.

4. 4

   Speculating about past possibilities

   If they had tried harder, they might have succeeded.

5. 5

   Showing cause and effect in the past

   If the weather had been better, we would have gone camping.

• Describes imaginary situations in the PAST.
• Structure: If + past perfect, would have + past participle.
• The situation did NOT happen — it's too late to change it.
• Used for regrets, criticism, and speculation about the past.
• Never use "would have" in the if-clause.
• "Could have" and "might have" can replace "would have".

Two colleagues are discussing a project that went wrong.