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 talking about experiences 2 it is used to talk about an action that has already ended 3 it´s auxiliaries are have and has 4 it´s assistant is did 5 past participle of theverb past simple assistant Present perfect simple auxiliaries past simple Present perfect simple verb present perfect simple