Ответ:

1) Margaret has been washing up for half an hour and has already broken some cups.

2) My friends have been doing the shopping all day long and have bought a lot of things.

3) I have been making pancakes since morning and have already made 20 pancakes.

4) Maxim has been trying to lose weight for ages, but he has only lost ten pounds so far.

5) Tourists have been looking for a monster in Loch Ness for many years but haven't seen it yet.

6) My dad has been reading detective stories since childhood and has already read 200 novels.

Объяснение: