Relacionar Columnas characteristics of two topicVersión en línea define which characteristics belong to the past simple or the present perfect simple por Silvia Pedraza 1 it is talking about experiences 2 it´s auxiliaries are have and has 3 it´s assistant is did 4 it is used to talk about an action that has already ended 5 past participle of theverb Present perfect simple verb past simple assistant past simple present perfect simple Present perfect simple auxiliaries