The Rule
The third conditional talks about imaginary situations in the past — things that did not happen. It is used for regrets, criticism, and speculation about past events.
| Structure | Example |
|---|---|
| If + past perfect, would have + past participle | If I had known, I would have told you. |
| Negative if-clause | If we hadn't missed the deadline, the client would have renewed. |
| Question form | What would you have done if you had been in my position? |
Contractions in natural speech:
If I'd known = If I had known · I would've told you = I would have told you
Could have / might have can replace would have to express possibility or ability:
If we had prepared better, we might have won the contract.
If she had asked earlier, I could have helped her.
If I'd known = If I had known · I would've told you = I would have told you
Could have / might have can replace would have to express possibility or ability:
If we had prepared better, we might have won the contract.
If she had asked earlier, I could have helped her.
Common Mistakes
If I would have known, I would have called you immediately.
If I had known, I would have called you immediately.
If she had studied harder, she would passed the exam.
If she had studied harder, she would have passed the exam.
We would have won the contract if we prepared better.
We would have won the contract if we had prepared better.
If I had more time yesterday, I would have finished it.
If I had had more time yesterday, I would have finished it.
Gap Fill — Press Enter to Check
Error Correction
Multiple Choice
Put the Words in the Correct Order
Sentence Transformation — Press Enter to Check
Conversation Practice
1
Describe a professional situation that went wrong. What would have happened if things had been different?
2
What would you have done differently if you had known at the start of your career what you know now?
3
Think of a project or decision at work: if one thing had changed, how would the outcome have been different?
Homework
Write 5 third conditional sentences about real situations in your professional life — things you regret, mistakes made, or turning points that could have gone differently.