Indefinite Articles worksheet featuring colorful images and blank spaces for students to practice using "a" and "an."

Let’s go step by step to fill in the blanks with the correct indefinite article: a or an.

Rule to remember:

- Use “a” before words that start with a consonant sound.
- Use “an” before words that start with a vowel sound (a, e, i, o, u).

Even if a word starts with a vowel letter, if it makes a consonant *sound*, use “a”.
Example: “a university” — because “university” sounds like “yoo-ni-ver-si-ty” → starts with a ‘y’ sound.

But for this worksheet, all the words are simple and follow the basic rule.

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Now let’s look at each row:

1. ___ cat → “cat” starts with ‘c’ → consonant sound → a
2. ___ apple → “apple” starts with ‘a’ → vowel sound → an

3. ___ igloo → “igloo” starts with ‘i’ → vowel sound → an
4. ___ coat → “coat” starts with ‘c’ → consonant sound → a

5. ___ laptop → “laptop” starts with ‘l’ → consonant sound → a
6. ___ owl → “owl” starts with ‘o’ → vowel sound → an

7. ___ snail → “snail” starts with ‘s’ → consonant sound → a
8. ___ umbrella → “umbrella” starts with ‘u’ → but it sounds like “uh-mbrel-la” → vowel sound → an

9. ___ book → “book” starts with ‘b’ → consonant sound → a
10. ___ elephant → “elephant” starts with ‘e’ → vowel sound → an

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Final Answer:
a cat
an apple
an igloo
a coat
a laptop
an owl
a snail
an umbrella
a book
an elephant