Present and Past Perfect simple

-Present Perfect simple:

Subject	To be	To have	To play
I	have been 've been	have had 've had	have played 've played
You	have been 've been	have had 've had	have played 've played
He	has been 's been	has had 's had	has played 's played
She	has been 's been	has had 's had	has played 's played
It	has been 's been	has had 's had	has played 's played
We	have been 've been	have had 've had	have played 've played
You	have been 've been	have had 've had	have played 've played
They	heve been 've been	have had 've had	have played 've played

Verb	Affirmative	Negative	Interrogative
To be	I have been to USA I've been to USA	I have not been to USA I haven't been to USA	Have I been to USA?
To have	You have had a computer You've had a computer	You have not  had a computer You haven't had a computer	Have you had a computer?
To play	He has played tennis He's played tennis	He has not played tennis He hasn't played tennis	Has he played tennis?

   -Usos:
        - Lo utilizamos cuando nos encontramos interesados en el resultado presente de algo  que ocurrió en un momento no definido del pasado.
        - Lo utilizamos para hablar acerca de una acción o situación que comenzó en el pasado y aún continúa.
        -Un ejemplo sería: I have been to USA, que en español es: yo he estado en USA

-Past Perfect simple:

Subject	To be	To have	To play
I	had been to USA	had had an exam	had played tennis
You	had been to USA	had had an exam	had played tennis
He	had been to USA	had had an exam	had played tennis
She	had been to USA	had had an exam	had played tennis
It	had been to USA	had had an exam	had played tennis
We	had been to USA	had had an exam	had played tennis
You	had been to USA	had had an exam	had played tennis
They	had been to USA	had had an exam	had played tennis

Verb	Affirmative	Negative	Interrogative
Finish	I had finished	I had not finished I hadn't finished	Had I finished?
Eat	They had eaten	They had not eaten They hadn't eaten	Had they eaten?
Forget	They had forgotten	You had not forgotten You hadn't forgotten	Has you forgotten?

-Usos:
        - .Para hablar de acciones o situaciones que se produjeron en el pasado, con anterioridad a otras     también pasadas.

        - Para referirse a acciones o situaciones que se produjeron con anterioridad a un momento concreto del pasado.

           - Con la expresión it was the first/second time.
        - Un ejemplo sería: I had finished, que en español es: yo había acabado. 

   Ejercicio