2. I have been playing the piano for ten years.
3. She has been studying the flora and fauna of Russia since 2013.
4. The boys have been playing football for 2 hours.
5. Jenny has been writing greeting cards since 2 o'clock p.m.
7. Susan has been doing her bedroom since morning.
8. We have been learning English for six years.
9. Mum has been cooking for two hours.
10. Dad has been watering the apple trees since 11 a.m.
11. My sister has been making a new dress since Tuesday.