3. Margo has been singing since she was a little girl. Nowadays she does it professionally.
4. Don has always wanted to become an ecologist and protect nature.
5. We have been learning Russian for many years but we often find the spelling of some Russian words difficult.
6. Becky have been learning pets, now she has a number of them.
7. Come and have tea with us, I have poured a cup for you.
8. People have known about the problem of pollution for more than a hundred years.
9. A number of good books have had a great influence on me.
10. The flat looks so nice. Have you been cleaning?
