You use the perfect tense when, in English, you would say that something ... First though, we need to know how haber is formed in the present tense. he, has, ha, hemos, habéis, han.

Has aprendido el pretérito perfecto. The first part of the perfect tense is the present tense of the verb haber, which is known as an auxiliary verb. An auxiliary verb, also called a helping verb ...