This tense is constructed by using the present tense of the auxiliary verb "haber" and the past participle. The present perfect tense expresses an action that occurred in the past but that is related to the present. Usually the present tense is used to describe types of circumstances, especially when the sentence tells how long the action has been occurring.
yo he hablado
I have talked
tú has hablado
you have talked
él/ella/usted ha hablado
he/she/you has talked
nosotros hemos hablado
we have talked
vosotros habéis hablado
you have talked
ellos/ellas/ustedes han hablado
they/you have talked
yo he servido
I have served
tú has servido
you have served
él/ella/usted ha servido
he/she/you has served
nosotros hemos servido
we have served
vosotros habéis servido
you have served
ellos/ellas/ustedes han servido
they/you have served
- Hemos viajado desde Mexico. (We have travelled from Mexico.)