Present Perfect

The Present Perfect tense is used for actions that happened at an unspecified time in the past or that started in the past and continue into the present.

STRUCTURE

POSITIVE:
(+) SUBJECT + AUXILIAR HAVE/HAS + VERB (PAST PARTICIPLE) + COMPLEMENT.

NEGATIVE:
(-) SUBJECT + AUXILIAR HAVE/HAS + NOT + VERB (PAST PARTICIPLE) + COMPLEMENT.

INTERROGATIVE:
(?) AUXILIAR HAVE/HAS + SUBJECT + VERB (PAST PARTICIPLE) + COMPLEMENT?

AUXILIAR HAVE/HAS CONJUGATION

I - HAVE
YOU - HAVE
HE - HAS
SHE - HAS
IT - HAS
WE - HAVE
YOU - HAVE
THEY - HAVE

EXAMPLES

(+) I have studied for the English class.
(-) I have not studied for the English class.
(?) Have I studied for the English class?

(+) He has bought a new guitar.
(-) He has not bought a new guitar.
(?) Has he bought a new guitar?

You can see the irregular verbs list in the following button: