Present perfect ✔

Present Perfect

  

You can use present perfect to describe completed actions that have taken place in 'time up to now'.

We use the verb TO BE:

TO BE
I	have been
You	have been
He	has been
She	has been
It	has been
We	have been
You	have been
They	have been

Now, we need the verb in Past Participle:

Subject	Positive	Negative	Question
I / you / we / they	I have spoken.	I have not spoken .	Have I spoken?
he / she / it	He has spoken.	He has not spoken.	Has he spoken?

Examples:

-"Have you ever met somebody on the Internet?"  

-"Yes, I have. / No, I haven't".

                                

 

-"Has your teacher even spoken to you in your own language?"

- "Yes, she has. / No, she hasn't".

*Note: You cannot use the present perfect if you want to describe when a completed action took place. You must use the Past Simple.

Exercises in this Web Sites:

http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?04
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?05
http://www.ego4u.com/en/cram-up/grammar/present-perfect-simple/exercises?07

Sources: 
Inside Out.
http://www.ego4u.com