How to form the perfect tense?
The perfect tense is formed with the present tense form of haber plus a past participle. The present tense forms of haber are: (yo) he, (tú) has, (él/ella) ha, (nosotros) hemos, (vosotros) habéis, (ellos/ellas) han. A past participle of a regular verb is formed by dropping the infinitive ending and adding: -ado (for -ar verbs), -ido (for -er and -ir verbs). E.g, the past participle for comer is 'comido'. Putting this together, we have 'nosotros hemos comido' which translates to 'we have eaten'.
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What is the difference between 'ser' and 'estar'? ¿Cuál es la diferencia entre 'ser' y 'estar'?
How do I form the future tense of a verb?
Conjuga los verbos ser y estar en presente de indicativo y explica la diferencia entre ambos.