The present perfect is formed from the present tense of the verb have and the past participle of a verb. We use the present perfect for something that started in the past and continues in the present.
when we are talking about our experience up to the present:
We often use the adverb ever to talk about experience up to the present: My last birthday was the worst day I have ever had.
and we use never for the negative form: Have you ever met George? Yes, but I've never met his wife.
We use have/has been when someone has gone to a place and returned: A: Have you ever been to San Francisco?
But when someone has not returned, we use have/has gone: Where's Maria? I haven't seen her for weeks.
More Examples
They've been married for nearly fifty years
She has lived in Liverpool all her life.
I've seen that film before
I've played the guitar ever since I was a teenager.
He has written three books and he is working on another one