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
He wouldn't have signed the lease agreement if he had corresponded with his advisor.
Would the subsidiary company have been a good investment, if investors had invested during the last year?
The capital allowance would have been granted if the merger had been approved by regulators.
If they had understood monetary policy better, we wouldn't be in this mess.
Do not use a comma, when placing the result clause first.
She would have ordered the TV online if the shipping cost had been lower.
The capital allowance would have been granted if the merger had been approved by regulators.