Ex 1 Put the verbs into the correct form

Ex 1 Put the verbs into the correct form

Helen has been washing the dishes for fifteen minutes.

My classmates have been writing a dictation since the beginning of the lesson.

Sam has been driving a car for five hours now.

I have been looking for information on the subject since last Friday.

Molly has been painting this picture for three days now.

The tourists have been doing the sightseeing since nine o'clock.

You have been working as a computer programmer for more than fifteen years.

The wind has been blowing since yesterday.

My grandfather has been collecting coins since he was a boy.

Andy and Den have been discussing the plans for their winter holidays for two hours now.