Write the cortex indefinite article for each word of group of words

___ 1. Native American folktale
___ 2. organ
___ 3. wind tunnel
___ 4. suitcase
___ 5. ostrich
___ 6. electric car
___ 7. surfboard
___ 8. butterfly
___ 9. encyclopedia
___ 10. schedule
___ 11. signature
___ 12. newspaper
___ 13. umbrella
___ 14. factory
___ 15. icicle
___ 16. railroad
___ 17. duchess
___ 18. airport
___ 19. university
___ 20. African spiritual

Do you mean "the correct indefinite article"?

If so, you just choose between "a" and "an" — depending on whether the first letter of the word or group begins with a vowel or consonant. I'll do the first 5 for you; then you do the rest, and I'll check your work.

a … 1. Native American folktale
an … 2. organ
a … 3. wind tunnel
a … 4. suitcase
an … 5. ostrich

Ya thank you I got

6: an
7: a
8: a
9: an
10: a
11: a
12: a
13: an
14: a
15: an
16: a
17: a
18: an
19: an
20: an

The only incorrect one is 19. Unfortunately, the way the letter "u" is pronounced at the beginning of a word is tricky.

In "umbrella" the "u" is the short sound, but in "uniform" the "u" is the long sound. For some reason, we use "an" with short-sound u's, but "a" with long-sound u's. (Long sounds of the vowels are the way we pronounce them as we say the alphabet.)

The indefinite article for each word or group of words would be:

1. a Native American folktale
2. an organ
3. a wind tunnel
4. a suitcase
5. an ostrich
6. an electric car
7. a surfboard
8. a butterfly
9. an encyclopedia
10. a schedule
11. a signature
12. a newspaper
13. an umbrella
14. a factory
15. an icicle
16. a railroad
17. a duchess
18. an airport
19. a university
20. an African spiritual

To determine whether to use "a" or "an" as the indefinite article, you need to consider the pronunciation of the word and specifically the sound that follows the article. Use "a" before words that begin with a consonant sound, and use "an" before words that begin with a vowel sound. For example, we say "an ostrich" because the pronunciation of "ostrich" begins with a vowel sound, while we say "a suitcase" because the pronunciation of "suitcase" begins with a consonant sound.