Conditional Perfect Conditional perfect is an English grammatical tense It relates an action that someone would have done Form would + have + past participle Affirmative I would have traveled around the world Interrogative Would you have traveled around the world? Negative I wouldn't have stayed in my hometown Use • Conditional perfect is used for something that might have happened in the past • It is also used in the main clause of conditional sentences type in type III Examples • She would have met him if she had come earlier • You would have got more money, if you had worked harder • He would have passed the test, if he had studied • We would have arrived on time, if we had run faster