Present Perfect Tense
This tenses are used to express your experience. This sentence can used to say that you have never had a certain experience. Present Perfect Tense didn’t use to describe specific event.
(+) S + Has/Have + Past Participle (V3)
ex: I have met her once before
(-) S + Has/Have + not + past participle (V3)
ex: I Have not met her before
(?) Has/Have + S + past participle (V3)
ex: Have You met her before?