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