Present Perfect Simple.
Used:
To speak of an action that began in the past and still continuousTo speak of a very recent past action and for which any reference of time does not occurTo speak about a past action whose results are reflected in the present
Forms:
AFIRMATIVE: forms with the present of the verb; to have' and the past of the verb that is conjugated
Exemples: I have played tennis
NEGATIVE: In the negative form ' is placed; not' after verb ' to have'
Exemples: He has not played
INTERROGATIVE: The interrogatory form forms later putting the first aid and the subject
Exemples: have you played
Present perfect continuos.
Used:
It is used when it is wanted to express the sense of the continuity of an action that has begun in the past, which it still lasts in the present and that even can continue in the future.
Forms:
Afirmative: subject + present perfect of ' to be' + gerund
Exemples: I have been playing
Negative: In the negative form ' is placed; not' after the aid
Exemples: I have not been playing
Interrogative:The interrogatory form, forms investing to the position of the subject and the aid
Exemples: Have I been playing?
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