thanks for paying attention to my request. There are four sentenses that drive me crazy :) The sentences and the keys are provided by a book for a CAE exam preparation.
1) She was breathing hard as if she HAD BEEN RUNNING.
I would write HAD RUN, but it isn't suggested. Why? I don't see that a duration of her running is important, but see a result - she was breathing hard.
2) Henson never thought about retirement. In fact he HAD BEEN MAKING a documentary film about the indigenous people of Chile when he died.
I would write WAS MAKING, but am I right that it means he literaly was making a film when his heart stopped beating? If yes, why again HAD MADE isn't an option? How to understand a neсessity of showing a duration?
3) Kind of the opposite situation ) Over the last year I HAVE RUN workshops on creative writing in twelve colleges and universities. I would write HAVE BEEN RUNNING, but it's incorrect. This time I see the duration - over last year - why we don't emphasize it?
4) a dialogue A HAVE YOU BEEN SWIMMING? You look really exhausted. B: I am. I did 50 lengths of the pool.*
Actually I think that two options are appropriate in the 4th sentence, HAVE YOU BEEN SWIMMING? and HAVE YOU SWUM? But the authors don't suggest the second option (and they would as they did in other sentences). I wonder why not Present Perfect, but PPC?
Hpope, it's not too much. I would appreciate your help.