TOEFL Primary · Step 1 · Book 1
Grammar — Unit 2: Plural Nouns
Learn how to make plural nouns — regular rules and tricky irregular forms. Choose the correct plural and check instantly.
📚 Grammar tip — Plural Nouns
Regular: add -s (book→books); add -es after s, ss, sh, ch, x (bus→buses); change y→-ies after a consonant (baby→babies); add -s after a vowel+y (key→keys); change f/fe→-ves (leaf→leaves).
Irregular (no rule — memorize):
| Singular | Plural | Singular | Plural |
|---|---|---|---|
| a man | men | a foot | feet |
| a woman | women | a mouse | mice |
| a child | children | a sheep | sheep |
| a tooth | teeth | a fish | fish |
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