I. 1. Tom has been playing the piano for 4 years.

2. I have been cooking for the party for 4 hours.

3. She has been working as a secretary for 2 years.

4. My father has been reading a newspaper for 2 hours.

5. My sister has been studying English for a year.

6. Scientists have been fighting against AIDS since 1980. 

7. The Browns bagan living in London 20 years ago.

8. John started working for this electronics firm in 1999.

9. Women began fighting for their rights in the middle of the 20th century.

10. Jack and Jill started learning to drive 2 weeks ago.

11. When did you begin studying English?

12. How long have you done research on lung cancer?

II. 1. This is the first time my father has driven a car.

2. It's the first time I have met such a famous singer.

3. It's the first time she has been to the ballet.

4. This is the first time she has drunk Coca Cola.