ничего не понимаю в английском ;(

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?