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.
"Hello"
2 = An event which would have followed 1, if 1 had have happened.
Past
had seen him
Now
would have said hello.
Future
If she had seen him, she would have said hello.
She would have said hello if she had seen him.
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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.