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