Gramatica del verbo irregular present perfect affirmative , .
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FORMACIÓN DEL "PRESENT PERFECT"
El "present perfect" de cualquier verbo está compuesto por dos elementos: la forma apropiada del verbo auxiliar to have (en presente) y el "past participle" del verbo principal. La forma del "past participle" de un verbo regular es raíz+ed, e.g. played, arrived, looked. En cuanto a los verbos irregulares, consulta la Tabla de verbos irregulares de la sección 'Verbos'.
AfirmativaSujetoto havepast participleShehasvisited.NegativaSujetoto have + notpast participleShehas not (hasn't)visited.Interrogativato havesujetopast participleHasshevisited?Interrogativa negativato have + notsujetopast participleHasn'tshevisited?TO WALK, "PRESENT PERFECT"AfirmativaNegativaInterrogativaI have walkedI haven't walkedHave I walked?You have walkedYou haven't walked.Have you walked?He, she, it has walkedHe, she, hasn't walkedHas he, she, it walked?We have walkedWe haven't walkedHave we walked?You have walkedYou haven't walkedHave you walked?They have walkedThey haven't walkedHave they walked?Otras preguntas