What Would Have Happened
Third Conditional
The third, or 'past', conditional is used to imagine past outcomes different than what actually took place. This conditional is used to express what would have been different if a person had done something differently.
'If' clause - past perfect + , + result clause - would + have + verb (conditional perfect tense)
Examples of Past Unreal Outcomes
She would have prepared desserts if Susan had thrown the party.
She would be there now if her boss had wanted to rent one of our conference centers.
Where would you have shopped for meals if you'd wanted to cook three meals per day?
He would still be here eating his meal if Susan hadn't found the rat.
Do not use a comma, when placing the result clause first.
She would have cut out seafood if the shrimp had been found to contain mercury.
She would have trained as a food service professional if she had got the job.