How long have you been living in Vietnam?
I've been living in Vietnam for/ since...
How long have you been studying English?
I've been studying English for/ since..
How long have you known your best friend?
I've known my best friend for/ since...
How long have belonged to the drama club?
I've belonged to the drama club for/ since...
How long have you been collecting rocks?
I've been collecting rocks for/ since..
How long have you been playing the piano?
I've been playing the piano for/ since...
How long have you known Ms. Carolyn?
I've known her for/ since...
How long have you been married?
I've been married for/ since...
How long have you been sleeping?
I've been sleeping for/ since...
How long have you been a cat?
I've been a cat for/ since...
How long have you been volunteering at a dog school?
I've been volunteering at a dog school for/ since...
How long have you been building websites?
I've been building websites for/ since...
How long have you had a smartphone?
I've had a smartphone for/ since...
How long have you owned a laptop?
I've owned a laptop for/ since...
How long have you been class president?
I've been class president for/ since...
How long have you been folding paper?
I've been folding paper for/ since...
