How long have you been learning English?
I have been learning English for two years.
How long have you been reading this book?
I have been reading this book for a month already.
How long have you been watching TV?
I have been watching TV for two hours.
How long have you been waiting for me?
I have been waiting for you for an hour already.
Since when has she been working in the bank?
She has been working in the bank since 1999.
Since when has he been living in Moscow?
He has been living in Moscow since he was born.
Since when have they been building the house?
They have been building the house since last year.
