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