A - an online worksheet - Free Printable

Let’s go through each word one by one. The blank before each word is for the article — either “a” or “an”. We use “a” before words that start with a consonant sound, and “an” before words that start with a vowel sound (a, e, i, o, u).

1. ___ book → “book” starts with ‘b’ (consonant) → a
2. ___ insect → “insect” starts with ‘i’ (vowel) → an
3. ___ cat → “cat” starts with ‘c’ (consonant) → a
4. ___ apple → “apple” starts with ‘a’ (vowel) → an
5. ___ backpack → “backpack” starts with ‘b’ (consonant) → a
6. ___ girl → “girl” starts with ‘g’ (consonant) → a
7. ___ elephant → “elephant” starts with ‘e’ (vowel) → an
8. ___ igloo → “igloo” starts with ‘i’ (vowel) → an
9. ___ alligator → “alligator” starts with ‘a’ (vowel) → an
10. ___ cake → “cake” starts with ‘c’ (consonant) → a
11. ___ eraser → “eraser” starts with ‘e’ (vowel) → an
12. ___ octopus → “octopus” starts with ‘o’ (vowel) → an

Now let’s double-check:

- Vowel sounds: insect, apple, elephant, igloo, alligator, eraser, octopus → all get “an”
- Consonant sounds: book, cat, backpack, girl, cake → all get “a”

That’s 7 “an” and 5 “a” — matches our list.

Final Answer:
a book
an insect
a cat
an apple
a backpack
a girl
an elephant
an igloo
an alligator
a cake
an eraser
an octopus