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