3. The present perfect is
formed by combining the
auxiliary verb "has" or
"have" with the past
participle.
I have studied.

4.  Affirmative Sentences (Frases
afirmativas) Subject _ auxilliary
verb (to have) + past participle
Examples:
 Play
 I've talked to Peter. (He hablado
con Peter.)
 Play
 She's gone to work. (Ha ido a su
trabajo.)
 Play
 They've learned English. (Han
aprendido inglés.)