My parents have been donating money to WWF for a long time.
The eco helpers have been planting the trees all the morning.
She has been collecting the rubbish to recycle for a week.
Engineers have been designing the green car for a long time.
Tony has been talking on the phone for two hours.
I have been looking for my keys since 11 am
Ann likes oranges, doesn't she?
Girls can sing well, can they?
The director is responsible for the social programme, is he?
boys don't like art lessons, do boys?
russian students will visit Britain in April won't they?
Andrew didn’t write an invitation letter, did he?
Our students like to speak English, don't they?
A rabbit can run well, can't it?
I'll be responsible for the school party, won't I?
Andy has been reading a book for 15 minutes, hasn't he?
Sally is collecting rubbish, isn't she?
They study at a secondary school, don't they?