Present Perfect:

​Use it to talk about RECENT EVENTS particulary when GIVING NEWS:

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​Have you heard?

Mike and Jessie have JUST get married.

JUST means that something has had happened recently.

- Can we go now?

​- Sure, I've JUST finished.

​We often use expression like JUST, EVER , NEVER, ALREADY, YET, SINCE and FOR:

Present Perfect:

We use FOR with a period of time (few days, hours or a week, half of a year) :

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We've been studying English FOR a year now.

​I've been waiting FOR an hour so far.

She's been driving SINCE she was a teenager.

We use SINCE with the time when the action started:

They've been working SINCE they were nine.