Plural Forms — English Grammar Exercises
tourist or tourists? some advice or an advice? — get it right
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.
Frequently Asked Questions
What is the difference between countable and uncountable nouns in English?
Countable nouns refer to things you can count individually: one book, two chairs, three problems. They have a singular and a plural form, and you can use a/an before them. Uncountable nouns refer to substances, concepts, or masses that are not divided into separate units: water, advice, information, furniture, traffic. You cannot say 'an advice' or 'furnitures'. To quantify them, use measure expressions: a piece of advice, a litre of water, two items of furniture.
Which English nouns are uncountable that learners often treat as countable?
The most common errors involve: advice (not 'advices'), information (not 'informations'), furniture (not 'furnitures'), equipment (not 'equipments'), luggage (not 'luggages'), progress (not 'progresses'), homework (not 'homeworks'), and traffic (not 'traffics'). These nouns are countable in many other languages, which is why the error persists even at B2 level. The fix is always a measure expression: 'three pieces of advice', 'a lot of information'.
What are the irregular plural forms of English nouns?
Key irregular plurals: man → men, woman → women, child → children, tooth → teeth, foot → feet, person → people, mouse → mice, goose → geese. Some nouns do not change at all: sheep → sheep, fish → fish, deer → deer, aircraft → aircraft, series → series. Nouns ending in -f/-fe often change to -ves: shelf → shelves, knife → knives, life → lives (exceptions: roof → roofs, chief → chiefs).
Is 'news' singular or plural? What about 'police' and 'mathematics'?
'News' looks plural but is always singular: 'The news is shocking', 'Was the news good?' — never 'the news are'. 'Police' is always plural and has no singular: 'The police are searching'; for one officer say 'a police officer'. Academic disciplines ending in -s (mathematics, physics, economics, athletics, politics) are singular: 'Mathematics is my favourite subject.' Clothing/tool plurals (jeans, trousers, scissors, glasses) are always plural: 'These jeans are too tight.'