Present Perfect

Present Perfect (experience)
Positive		Negative
I've (I have)	been to Barcelona.	I haven't	worked in a shop.
You've (You have)		You haven't
He's (He has)		He hasn't
She's (She has)		She hasn't
It's (It has)		It hasn't
We've (We have)		We haven't
They've (They have)		They haven't
Question	Yes	No
Have you worked in a shop?	Yes, I have.	No, I haven't.
Has he been to Barcelona.	Yes, he has.	No, he hasn't.

Use the Present Perfect to talk about past experiences when you don't say exactly when they happened.
For regular verbs the past participle is the same as the past simple (+ed)