1.

A: I have been trying to contact you all week.

B: Sorry. I've just returned from a trip to Sweden.

2.

A: Sarah has been practicing that piano piece for days.

B: Yes. She has an important concert next week.

3.

A: I have been reading a book called "The Moneyless Man" all week.

B: I heard that the author has been living without money since 2008.

4.

A: Mark has been working so hard, he's completely exhausted.

B: Oh, that's why he hasn't been playing football for a while.