options: f : oh , you have been a bus driver for about one year . f : you have been a bus driver for about 10 years . f : wow . you have been a bus driver for about 11 years . f : i have been a bus driver for about 11 years .
article: f : so , how long have you been driving this bus ? m : for about a year . but before i drove this bus , i had been driving buses for 10 years .