1. He has been talking for 2 years about his trip to Australia.
2. He has been looking for his book all the morning.
3. I have been wondering if I couldn't study German a little more.
4. He hasn't been thinking about his girlfriend all the week.
5. We have been just talking about you.
6. I have been writing for you for about thirty minutes.
7. He hasn't been sitting in that chair all the evening.
8. Have we been traveling though Texas for 4 years?
9. We haven't been listening to the radio all the morning.
10. Has he been waiting for the bus for half an hour?
