Plural Forms
Master all English plural spelling rules — regular (-s, -es, -ies, -ves), zero-plural (sheep, aircraft), and irregular (child → children, tooth → teeth) — with 10 exercises.
English Plural Forms
Forming the plural correctly is one of the first grammar skills learners acquire, yet errors persist well into B2 level. Analysis of the Cambridge Learner Corpus shows that irregular plural errors appear in over 12% of B1–B2 writing samples, with 'womans', 'childs', 'sheeps', and 'aircrafts' among the most frequent. The difficulty is that English applies six different spelling rules, plus a category of zero-plural nouns and a separate list of historically irregular forms that share no common pattern. Systematic practice with all categories — not just the common -s rule — is essential to reach reliable accuracy.
Regular Plural Rules
Most nouns simply add -s. The other rules apply to specific endings:
- Ending in -ch, -sh, -s, -x, -z: add -es (watch → watches, bus → buses, box → boxes)
- Consonant + -y: change to -ies (family → families, country → countries)
- Vowel + -y: add -s (day → days, key → keys)
- Most -f/-fe endings: change to -ves (shelf → shelves, knife → knives, life → lives)
- Exceptions to the -f rule: roof → roofs, chief → chiefs, belief → beliefs
Zero-Plural Nouns
These nouns use the same form for singular and plural. No additional ending is ever added:
one fish → many fish
one aircraft → a fleet of aircraft
one series → two series
Irregular Plurals
tooth → teeth | foot → feet | goose → geese
person → people | mouse → mice
Common Mistakes
✗ British Airways owns many aircrafts. → ✓ British Airways owns many aircraft.
✗ I need new shelfs for my books. → ✓ I need new shelves for my books.