1. He knows quite a lot of English. He has been learning it for six years.
2. I have been making cakes. That’s why my hands are all covered with flour.
3. Her phone hasbeenringing for ten minutes. I wonder why she doesn’t answer it.
4. We havewalked ten kilometres.
5. There is sawdust in your hair. – I’m not surprised. I havebeencutting down a tree.
6. She hadbeensleeping for 3 hours when we returned.
7. They hadbeenmaking their way through thick forest for some time before they came to a little house.
8. By midnight they willhavebeenriding for two hours.
9. Nick wrote the letter yesterday and he hadn’t written it before I came.
10. Mother wasn’t at home when I came. She had gone out half an hour before.