FluencyLab
GrammarHub
Use the third conditional to imagine a different past and its unreal past result.
Overview
Use the third conditional to imagine a different past and its unreal past result.
Form and rules
Form it with if + past perfect, would have + past participle.
It describes a past condition that did not happen and an imagined past result.
Could have or might have can replace would have for ability or possibility.
Do not use would have in the if-clause in the standard form.
Third conditionals often express regret, criticism or reflection on past consequences.
A closer look
Do not use would have in the if-clause in the standard form.
Third conditionals often express regret, criticism or reflection on past consequences.
Examples
If I'd known, I would have called.
She would have passed if she'd studied more.
If we had left earlier, we might have caught the train.
I could have helped if you'd asked.
If it hadn't rained, we would have eaten outside.
Common mistakes
The unreal past condition uses past perfect.
The imagined past result uses would have + past participle.
Ready to practise?
The test combines multiple choice, gap completion, error correction, and sentence building so students have to recognise and produce the grammar, not simply reread the rule.