1/ For imaginary past actions, where the conditions for the action WERE NOT satisfied.
eg: If you'd been there, you would've seen it. (The conditions were not met because the person was not there and as a result did not see it.)
If + Past Perfect, + Would have + Past Participle
See Also: Conditionals; Modal Verb; 1st Conditional; 2nd Conditional; Zero Conditional; Verb Related Article English Conditionals - Read up on the English Conditional and discover how they are used to talk about possible or imaginary situations
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