Form the third conditional with if plus the past perfect, followed by would have plus the past participle, as in if I had studied harder, I would have passed the exam, to express regret about something in the past that did not actually happen. Both the situation and the result are impossible to change now.
Grammar Rule
The third conditional expresses regret about something in the past that did not actually happen; both the situation and the result are impossible to change now.
Third Conditional: Rules and Examples
| Clause | Structure | Example |
|---|---|---|
| If clause | if + past perfect | If I had studied harder… If she had left earlier… |
| Result clause | would have + past participle | …I would have passed the exam. …she wouldn’t have missed the train. |
Remember: if + past perfect, would have + past participle, for regrets about the past.
Practice Test
Instructions
Answer each question in the test below forming the correct third conditional sentence. You will get a new random set of questions every time you retake the test, plus a downloadable results summary with your name and score at the end.
Third Conditional
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Frequently Asked Questions
How do you form the third conditional?
Use if plus the past perfect, followed by would have plus the past participle, as in if I had studied harder, I would have passed the exam.
When do you use the third conditional?
Use it to express regret about something in the past that did not happen, as in if she had left earlier, she wouldn’t have missed the train.
Can the situation in the third conditional still be changed?
No, both the situation and the result belong to the past and are impossible to change now.
How is the third conditional different from the second?
The second conditional talks about unreal present or future situations, while the third talks about unreal past situations and their imagined past results.