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Conditionals
Third Conditional
Third Conditional
The Third Conditional describes unreal past situations — imagining a different outcome to something that has already happened. It expresses regret, criticism, or speculation about the past.
Formula
Standard
If + past perfect (had + PP), would have + past participle
Result variations
could have / might have instead of would have
Inverted form (formal)
Had + S + PP, ... (omit 'if'; invert subject and had)
Example Sentences
If the team had planned better, they would have avoided the budget overrun.
If she had reviewed the data, she would have caught the error.
We would have won the contract if we had submitted earlier.
Had they invested in training, productivity would have improved.
If I had known about the problem, I would have reported it.
The project would have succeeded if the client had provided clear requirements.
She would have been promoted if she had stayed with the company.
Had the manager been informed, he could have prevented the issue.
If we had used a different supplier, costs would have been lower.
They would have met the deadline if there had not been a system failure.
Common Mistakes
If she would have reviewed the data, she would have caught the error.
If she had reviewed the data, she would have caught the error.
The 'if' clause uses past perfect (had + PP), NOT 'would have'.
Had the team check the specs, they would have avoided the error.
Had the team checked the specs...
Inverted Third Conditional: Had + subject + PAST PARTICIPLE (not base verb).
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