Present Perfect Simple, use this tense for complete or finished actions in the past, use this tense with just/already/yet, this tense focuses on the present result of a past situation, it's better to use this tense with state verbs (konw, understand, believe), use this tense with ever/never/before, Present Perfect Continuous, use this tense for repeated actions that continue to the present, this tense focuses on the cause of a present situation, it focuses on how long something has been happening.

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