18.2
How long do you know Margaret?
How long does Diana learns italian?
How long does your brother lives in Canada?
How long is it raining?
How long am i a teacher?
How long Jill is on holiday?
18.3
We've been on holiday since Sunday.
The sun has been shining all day.
She's been waiting for 10 minutes.
He has a beard since his was 20.
