Your hands are so dirty! What have you been doing?
I have been repairing my car.
The machine is OK. I have repaired it.
How long have you been reading this book?
Have you read this book?
Where is Dasha and Oleg? - They are playing tennis. They have been playing for 2 hours.
Have you ever played tennis?
This week we have played tennis 3 times.
Today I have written 5 letters.
I have been writing letters all morning today.
It's good to see you again. What have you been doing since we last met?
You've been eating too much recently.
You should eat less.