1. I've been waiting here for 2 hours.2. We've been preparing for the exam since early morning.3. I've been waiting for my friend since 6 a.m.4. Nancy has been skiing since she was 8.5. We've been here for 7 years.6. I haven't been smoking for a long time.7. How long ago have you read this book?8. He's been watching TV for the whole evening.9. There has been no snow since 1993.10.Jane has been playing the piano simce she was 5.