Present Perfect: talk about an event during a period of time that is still continuing, we use it to day how long a situation has existed, often with FOR/SINCE/HOW LONG, we use it to talk about an event that has a strong connection with the present, often with JUST/ALREADY/YET, we use it to talk about an experience at an unspecified time in the past, often with EVER/NEVER, Past Simple: talk about a specific occasion in the past,

present perfect VS present simple

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