PRESENT PERF. SIMPLE (have/has + past participle), when the result is more important, to say how many times, to talk about life experiences, to talk about a (recently) finished activity, PRESENT PERF. CONT. (have/has + been + -ing), to say how long, to give an explanation (e.g. why I am so tired), when the action is more important, to talk about a recent action that might not be finished

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