We have been decorating our house since five o'clock.
He has been reading the book for three hours.
Carmen has been working on the project since morning.
I have been waiting for him for several hours.
She hasn’t been reading your letters since January.
I haven’t been teaching English since 2011.
He hasn’t been skiing in the mountains for a month.
We haven’t been painting the walls for a long time.
Has the dog been barking for more than an hour?
We haven’t been painting the walls for a long time?