Odpowiedź:
2 How long has Grandma been using my laptop?
She's been using it since dinner.
3 How long has he been giving the lecture?
He's been giving the lecture for 30 minutes.
4 How long have you been developing the products?
I've been developing the products for three years.
5 How long have they been working as a part of a team?
They have been working as a part of a team since last week.
6 How long have you been writing this program?
I've been writing it for two days.
7 How long has his little brother been using touchscreen?
He's been using it since he was two years old.
8 How long have you been wondering how this gadget works?
I've been wondering for three hours.
