Present Perfect (have + past participle) • for an action that started in the past and continues to the present with stative verbs. He has known Alice for years. • for an action which happened at an unstated time in the past and is connected with the present. He has met him before. (When? We don't know.) • to talk about experiences or talk about sth which happened recently. I've cut my finger. There are no trains. There's been an accident. Present Perfect Continuous (have been + -ing form) • to put emphasis on the duration of an action which started in the past and continues up to the present. He has been studying English since he was 10. • for an action that has recently/just stopped and its results are visible in the present. She has been working all day. She's tired now.
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