Third and mixed conditionals
Imagining a different past
- The third conditional imagines a past that didn't happen.
- If I had studied, I would have passed. (but I didn't, so I failed)
- It often expresses regret or blame.
Third conditional
If + past perfect, would have + past participle.- For an unreal past — the opposite of what really happened.
- If they had left earlier, they would have caught the train.
Complete the third conditional: If I had studied, I ___ the exam.
Third conditional: If + past perfect, would HAVE + past participle.
Complete: If they had left earlier, they would have ___ (catch) the train.
would have + past participle: catch → caught.
Translate into English: 如果我当时学习了,就会通过考试了。
Unreal past → third conditional: “If I had studied, I would have passed.”
Mixed conditional
- A past cause with a present result.
If + past perfect, would + base verb.- If I had saved money, I would be rich now. (would, not would have)
Third or mixed? Watch the result
Both start with 'if + past perfect' — the RESULT clause decides: past result → third, present result → mixed.
Mixed (past cause → present result): “If I had saved money, I would be rich now.” Correct?
Yes — past perfect in the if-clause, “would + base verb” for the present result.
All conditionals at a glance
- Zero / first: real (present + will).
- Second: unreal present (past + would).
- Third: unreal past (past perfect + would have).
Common mistakes
- ❌ If I would have known, I would have come. → ✓ If I had known… — no would in the if-clause.
- ❌ If I had studied, I would pass yesterday. → ✓ …I would have passed. — a past result needs would have.
- Decode I'd: + past participle = had; + have + participle = would.
Match each if-clause to its result.
Past cause → present result = mixed; past cause → past result = third; unreal now = second.
If she ___ the bus, she would have been on time.
Third conditional: If + past perfect, would have + participle.
- Third conditional (unreal past): If + past perfect, would have + p.p.
- Mixed (past cause → present result): If + past perfect, would + base verb.
- The if-clause's tense tells you which conditional it is.
Think of a past regret. Write one third-conditional sentence (If + past perfect, would have + past participle).
Example: “If I had woken up earlier, I wouldn't have missed the bus.”