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have, like,
know, be,
for, since.
They have been friends for twenty years.
(They met each other twenty years ago and
they are still friends.)
for, since, all morning/day/week.
Sarah has been picking vegetables for two hours.
(She started picking two hours ago and she is still
picking them now.)
She has picked a lot of apples.
(The apples are in the basket,
so the action has finished.)
He is dirty. He has been playing football.
(He is no longer playing football, but the fact that
his clothes are dirty is visible now.)
She has received three faxes this morning. (The action has
been repeated three times up to now and may happen again
because the time period – this morning – is not over yet.)
She received three faxes this morning. (The time period - this
morning – is over. It is now afternoon or evening.)
