Rewrite the following sentences, using the words given:
1.Tom began playing the piano 4 years ago.
->Tom has .
2. I started cooking for the party 4 hours ago.
->I have .
3. She started working as a secretary 2 years ago.
->She .
4. My father is reading a newspaper. He started 2 hours ago.
->My father .
5.My sister began to study English a year ago.
->My sister .
6.Scientists began to fight against AIDS in 1980.
->Scientists have
7.The Browns have been living in London for 20 years.
->The Browns began
8. John has worked for this electronics firm since 1999.
->John started
9. Women have been fighting for their rights since the middle of the 20th century.
->Women began
10. Jack and Jill have learned to drive for 2 weeks.
->Jack and Jill started
11. How long have you studied English?
->When
12. When did you begin to do research on lung cancer?
->How long
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