Present Perfect Progressive

The Present Perfect Progressive is used:

To emphasize the duration of a state or action,

which started in the past and coninues up

to the present.

"I've learning English for 6 years"

To talk about an action which happened over a period

of time in the past and may have finished,

but the results are obvius in the present.

"We're been walking around all day. "

That's why we're so tired.