3. use a or an. write the correct forms of the indefinite articles into the gaps. there is no article in some sentences. 1. there is green english book on the desk. 2. she's reading old comic. 3. they've got idea. 4. he is drinking cup of coffee. 5. the girl pilot. 6. leipzig has airport. 7. this is bike. 8. look! there' bird flying. 9. my father honest person. 10. my friend likes to astronaut. 11. is a very good friend. 12. is everything to me. 13. i prefer . 14. i have cats in my room.