Present perfect simple or continuous
Often there is very little difference between the present perfect simple and the present perfect continuous. In many cases, both are equally acceptable.
They've been working here for a long time but Andy has worked here for even longer.
To emphasize the action, we use the continuous form.
We've been working really hard for a couple of months.
She's been having a hard time.
To emphasize the result of the action, we use the simple form.
I've made fifteen phone calls this morning.
Look at the difference in these examples.
I've been reading this book for two months but I've only read half of it. It's very difficult to read.
When an action is finished and you can see the results, use the continuous form.
The phone bill is enormous. You've been calling your boyfriend in Australia, haven't you?
When you use the words 'ever' or 'never', use the simple form.
I don't know them. I've never met them.
You're red in the face. Have you been running?
Have you ever heard anything so strange in your life.
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