Помогите с Present Perfect дам 34 балла
Helen … (to wash) the dishes for fifteen minutes.
My classmates … (to write) a dictation since the beginning of the lesson.
Sam … (to drive) a car for five hours now.
I … (to look) for information on the subject since last Friday.
Molly … (to paint) this picture for three days now.
The tourists … (to do) the sightseeing since nine o’clock.
You … (to work) as a computer programmer for more than fifteen years.
The wind … (to blow) since yesterday.
My grandfather … (to collect) coins since he was a boy.
Andy and Den … (to discuss) the plans for their winter holidays for two hours now.