Maria has been studying English since 1999.
How long has Maria been studying English?
My cousin has been playing football for muchly 4 years.
How long has your cousin been playing football?
Alison has been skating for the whole 5 hours.
How long has Alison been skating
We have been waiting here for the whole 3 hours.
How long have you been waiting here?
Bill has been doing homework since he came back.
How long has Bill been doing homework?