2. Put verbs into Present Perfect Continuous and write FOR / SINCE.

1. Alice has been drawing a picture for two hours.
2. The dogs have been barking since early morning.
3. I have been writing a story for three days.
4. You have been talking on the phone for an hour!
5. The cat has been sleeping since 5 o'clock.
6. We have been waiting for our friends for half an hour.
7. It has been snowing for three hours.
8. The birds have been singing since the sun rose.
9. Nick has been building a house for two years.