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 past participle of theverb 5 it is used to talk about an action that has already ended Present perfect simple auxiliaries past simple Present perfect simple verb present perfect simple past simple assistant