Gramatyka angielski articles

1. I have aanAn book.
2. I can see aanAn mountain.
3. I have bought aanAn house.
4. Yesterday I met aanAn friend.
5. aanAn elephant is heavy. (i.e. "any elephant" or "all elephants")
6. Ernest Hemingway was aanAn writer.
7. Isaac Newton became aanAn great scientist.
8. What aanAn nice day!
9. What aanAn charming person!
10. I have aanAn few friends. ("several friends")
11. I have aanAn little fortune. ("some money")
12. He was aanAn Einstein of his time.
13. Tom will never be aanAn Nelson.
14. It cost $10 aanAn dozen.
15. There were aanAn lot of people at the concert.
16. They need aanAn great deal more money to finish the film.
17. He has aanAn strong character.
18. Do you know that Robert Wilson has aanAn good knowledge of Chinese?
19. This is aanAn better strawberry.
20. This is aanAn more interesting book.