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If - third conditional
If + subject+ past perfect verb phrase, subject + would + have + past participle verb
Subject + would + have + past participle verb + if + subject + past perfect verb phrase
Third Conditional - Explain
1 = An event in the past that did not happen.


2 = An event which would have followed 1, if 1 had have happened.
Past
Now
Future
Past perfect tense
would have past participle
Third Conditional - Examples
1 = An event in the past that did not happen.


2 = An event which would have followed 1, if 1 had have happened.
Past
Now
Future
had eaten this
would have been ill
If I had eaten this, I would have been ill.
I would have been ill if I had eaten this.
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Did event 1 happen? No.
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Did event 2 happen? No.
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If event 1 did happen, would event 2 happen? Yes.
1 = An event in the past that did not happen.