The conditional perfect is a grammatical construction that combines the conditional mood with perfect aspect. A typical example is the English would have written. The conditional perfect is used to refer to a hypothetical, usually counterfactual, event or circumstance placed in the past, contingent on some other circumstance (again normally counterfactual, and also usually placed in the past). Like the present conditional (a form like would write), the conditional perfect typically appears in the apodosis (the main clause, expressing the consequent) in a conditional sentence.