What's the difference?
Present Perfect Simple and Present Perfect Continuous

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We use both of these tenses for finished and unfinished actions.

The present perfect simple can be used (often with 'since' and 'for') to talk about unfinished actions that started in the past and are still true in the present. It's often used with stative verbs: The present perfect continuous can also be used (often with 'since' and 'for') to talk about unfinished actions that started in the past and are still true in the present. (Of course, we don't use the present perfect continuous with stative verbs): Sometimes there's really no difference in meaning between the two tenses. This is especially the case with verbs such as 'live', 'work' and 'study': Sometimes, there is a difference in meaning:

1: The present perfect continuous can be used to emphasise the length of time that has passed. The present perfect simple is generally neutral: 2: On the other hand, the present perfect simple is often used when we're talking about how much or how many. This isn't possible with the present perfect continuous: 3: The present perfect continuous often focuses on the action itself, while the present perfect simple focuses on the fact that the action is completed: We use 'yet' and 'already' with the present perfect simple: This difference is often used to talk about different kinds of results in the present. The present perfect simple is used when the action is finished, and the result comes from the action being finished: The present perfect continuous is used when the result comes from the action itself. It doesn't matter if the whole action is finished or not. The result is often something we can see, hear, smell, or feel: 4: Finally, the present perfect continuous can be used to emphasise that something is temporary:

Click here for more about the present perfect simple tense.
Click here for more about the present perfect continuous tense.
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If you want to learn more about the tenses, especially about how to use them when you're speaking, you could try my video course, Terrific Tenses, which is part of Perfect English Grammar Plus.