Question

It's 12 o'clock now.The following people have been busy all morning .Look at the information and say what they have been doing and how long they have been
doing and how long they have been doing it for,as in the example.
пример lynn's been tidying the garden for three hours/since 9 o'clock.

Answer 1

Kim has been cleaning windows since 11 o'clock
Maria has been revising for exams since 10:30 am
Jim has been programming computer since 11:30 am
David has been washing car since 10 o'clock