Conditional Perfect

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1. Use of the Conditional Perfect

We use it for something that might have happened in the past.

We use it in the main clause in type III of the if clauses.

2. Form

would + have + past participle

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

3. Example

I would have phoned you if you hadn't switched your mobile off.