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
If they had understood monetary policy better, we wouldn't be in this mess.
The capital allowance would have been granted if the merger had been approved by regulators.
She would have ordered the TV online if the shipping cost had been lower.
If they had known about the project before, this project wouldn't be listed on short notice.
Do not use a comma, when placing the result clause first.
He would have invested in the futures market if he'd had more confidence in the economy.
She would have ordered the TV online if the shipping cost had been lower.