Structure: Have / Has + verb Past Participle.

I / you / we / they : HAVE /HAVEN'T

he / she / it : HAS / HASN'T.

Use of Present Perfect

puts emphasis on the result
Example: She has written five letters.
action that is still going on
Example: School has not started yet.
action that stopped recently
Example: She has cooked dinner.
finished action that has an influence on the present
Example: I have lost my key.
action that has taken place once, never or several times before the moment of speaking
Example: I have never been to Australia.

Signal Words of Present Perfect

	Creado por Luis Alava hace más de 4 años

Use of past simple and present perfect