PRESENT PERFECT SIMPLE

USE

puts emphasis on the result
Example: She has written five letters.

action that is still going on
Example: School has not started yet.

action that stopped recently
Example: She has cooked dinner.
f

inished action that has an influence on the present
Example: I have lost my key.

action that has taken place once, never or several times before the moment of speaking
Example: I have never been to Australia.

PRESENT PERFECT CONTINUOUS

We use the Present Perfect Continuous to show that something started in the past and has continued up until now. "For five minutes," "for two weeks," and "since Tuesday" are all durations which can be used with the Present Perfect Continuous.

Examples:

They have been talking for the last hour.
She has been working at that company for three years.
What have you been doing for the last 30 minutes?
James has been teaching at the university since June.
We have been waiting here for over two hours!
Why has Nancy not been taking her medicine for the last three days?

cresdits:English Grammar Book