1.A:I'm very tired.
B:That's because you HAVE BEEN WORKING too hard.
A:I know.But at last I HAVE FINISHED my composition.
2.A:You look hot.What HAVE YOU BEEN DOING?
B:I HAVE BEEN PALYING tennis with Sarah.
A:Oh,yes.I HAVE SEEN her play before.She's good,isn't she?
Pam:What are you doing,Ben?
Ben:I've been looking through my old toy box all morning.It brings back lots of memories.Look,I HAVE FOUND my old train set!
Pam:You HAVE BEEN PLAYING with those trains for over an hour.I HAVE BEEN WATCHING you.
Ben:They great!I HAVEN'T HAD so much fun for years.Look at the this one!
Pam:Yes,Bem-it's very nice train.But HAVE YOU SEEN what time it is?
Ben:No...Why?
Pam:It's 10.30.Your boss HAS PHONED from the office.
Ben:why?
Pam:He HAS BEEN WAITING for you all morning