When does a word need -es instead of -s?

When the word ends in a hissy sound (s, x, sh, ch), plain -s can't be heard, so English adds -es to give the ending its own beat: boxes, buses, dishes. Say both versions aloud and the need becomes obvious even to a six-year-old.

What about words like mice and feet?

Those irregular plurals get their own worksheets in 2nd grade. First grade builds the dependable rule first, so the exceptions have something to be exceptions to.

1st grade plural noun rules

1st grade plural noun rules worksheets

Plural means more than one, and most nouns show it with a simple -s: one cat, two cats. Words that end in a hissing sound (box, bus, dish) need -es, and first graders write the right plural with a number word as their clue.

Free printable PDF worksheet, aligned to Common Core L.1.1.c.

Each print is a different sheet with its own answer key. You don't need to sign up.

The kind of sentences you'll fix

Write the plural of the word in parentheses to complete each sentence.

Six (sandwich) sit on the tray.
Fixed: Six sandwiches sit on the tray.
Both (bush) grew red berries.
All the (frog) hop off the log.

Every print pulls a new set of sentences at this level, so a make-up test or a second sibling gets a different mix.

What's on a 1st grade sheet

1st grade sheets draw from 60 sentences, 6 to a page. None of these sentences are on 2nd grade sheets. 2nd grade sheets print 7 to a page.

A few of the sentences, as the answer key corrects them:

Some ants march up the hill.
Two beds fit in my room.
Five corncobs roast on the grill.

Fix it. Write the plural of the word in parentheses to complete each sentence. 6 sentences to fix per page.
Choose the word. Circle the letter of the correctly spelled plural. 10 questions per page.

Every version prints on US Letter or A4, with its answer key on the last page.

How to teach this

Count everything: one sock, two socks, one box, two boxes. The -es words earn a special ear check: try saying "two boxs" and hear how the ending disappears; that's WHY the e is there. Keep irregulars like mice for next year; this year is the reliable -s and -es.

Watch for: The -es rule follows the sound: you can hear the extra beat in fox-es and bench-es. If you can hear it, spell it. Words ending in vowel + y just add -s: boys, days, keys. Only consonant + y changes to -ies.

Common questions about 1st grade plural noun rules

When does a word need -es instead of -s?: When the word ends in a hissy sound (s, x, sh, ch), plain -s can't be heard, so English adds -es to give the ending its own beat: boxes, buses, dishes. Say both versions aloud and the need becomes obvious even to a six-year-old.
What about words like mice and feet?: Those irregular plurals get their own worksheets in 2nd grade. First grade builds the dependable rule first, so the exceptions have something to be exceptions to.

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Aligned to Common Core L.1.1.c. Reviewed by the One more sheet team. Content version 241, updated October 2026.

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