First though, we need to know how haber is formed in the present tense. he, has, ha, hemos, habéis, han. Here’s an example of the perfect tense in use: Ha ganado la carrera. - ‘She has won ...

The abstract is usually in the past tense due to it showing what has already been studied. Example: “This study was conducted at the Iyarina Field School, and within the indigenous Waorani community ...

For example, He hecho mis deberes - I have ... 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 ...