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Conditional Perfect Simple

1. Use of the Conditional Perfect Simple

We use it for something that might have happened in the past and to talk about what would have been the result.

It is basically the main clause in a Third Conditional type sentence.

2. Form

would + have past participle

past participle → (infinitive + ed) or (3rd column of the table of the irregular verbs)

3. Example

would have visited you if I had known your address.