Articles A/AN

1. A pizza

2. It's a book

3. It´s a clock

4. Articles indefinite because it implies that the thing mentioned is non-specific.

5. DDS

6. Is used "a" only with singular nouns

7. Examples using "a"

8. Explication

9. Explication

10. An actor

11. Examples using"an"

12. Is used "an" with words beginning with a vowel sound

13. when is it used

14. example

15. An old telephone