They haven't been looking for him since Saturday.
George has been collecting stamps since he left school.
Have you been ringing her up all morning?
I have been studying English for 5 years.
They haven't been building a house for 3 years.
Mr. Green have been repairing his car for 2 days.
How long has she been living here?
She haven't been singing a song all day.
How long have you been reading this book?
How long have you been playing basketball?