Singular and Plural Nouns: Rules, Irregular Plurals and Examples

One book or two books? One child or two childs? Choosing between singular and plural looks simple until English gives you children, mice, sheep, criteria and information. Knowing how plurals are formed, and which nouns break the rules, is essential for correct spelling, grammar and verb agreement.

This guide explains singular and plural nouns, every regular spelling rule, and all the main groups of irregular plurals. It gives over 360 nouns and noun types in tables, with a "how it is formed" column for each. It also covers plural-only and uncountable nouns, compound nouns, collective nouns, verb agreement, common mistakes, key points, ten practice questions and a teacher activity.

It builds on Parts of Speech and Sentence Structure, and connects with Tenses & Verb Forms for verb agreement and with Common Errors in English. Spelling in this guide follows British English.

1.What Are Singular and Plural Nouns?

A noun names a person, place, thing or idea. English nouns have two numbers:

• Singular means one: a book, one child, a city.
• Plural means more than one: books, children, cities.

The number of the noun controls the verb: The book is on the table but The books are on the table. Nouns that can be counted are countable and have both forms. Nouns that cannot be counted are uncountable and usually have only a singular form (information, advice).

2.The Regular Plural Rules at a Glance

The ending -es is used when -s alone would be hard to say: bus-es, church-es.

3.Regular Plurals Adding -s

4.Plurals Adding -es (after s, ss, sh, ch, x, z)

5.Nouns Ending in Consonant + y

6.Nouns Ending in Vowel + y

Proper names also keep the y: two Kennedys, the Sallys.

7.Nouns Ending in -f or -fe: Plural -ves

Some of these have a second form in careful English: scarves or scarfs, hooves or hoofs, dwarfs or dwarves. The -ves forms are the standard ones in this list.

Nouns ending in -f, -ff or -fe that simply add -s

8.Nouns Ending in -o

There is no perfect rule. A useful guide: nouns that are shortened words (photo, piano, kilo) and nouns with a vowel before o (zoo, radio) add -s. Many older words with a consonant before o add -es.

Add -es

Add -s

9.Irregular Plurals: Vowel Changes and Other Forms

A small group of very old and very common nouns does not follow the rules. They must be learned one by one.

10.Nouns with the Same Singular and Plural

These nouns do not change. Use the context and the verb to show the number: One sheep is in the field. Ten sheep are in the field.

11.Plurals of Words from Latin, Greek and French

Many scientific and academic words keep the plural of the language they came from. In everyday English, some also accept a regular plural in -s, and these are shown with "or".

Note on data. Data is the plural of datum, but in modern English it is often used as a singular noun (The data is clear). In formal science writing, the plural verb is still common: The data are clear.

Difficult and unusual plurals that are hard to remember

These are the words that cause most mistakes in examinations. Learn them in groups by ending.

12.Compound Nouns

In most compound nouns, make the main noun plural, which is usually the first word when the compound is joined by prepositions or hyphens. Compounds written as one word usually add -s at the end.

13.Nouns That Are Always Plural

These nouns have no singular form. Many name things with two parts. Use a pair of to count them: a pair of scissors, two pairs of trousers.

Others in this group include goods, belongings, thanks, savings, earnings, surroundings, riches, congratulations, outskirts, premises, stairs, binoculars, tweezers.

14.Uncountable Nouns: No Plural Form

These nouns name substances, ideas and groups as a whole. They take a singular verb and are not used with a or with numbers. To count them, use a unit word.

Correct: Please give me some advice. Incorrect: Please give me some advices.

15.Nouns That Change Meaning in the Plural

Nouns with two plurals and different meanings

16.Collective Nouns and Verb Agreement

A collective noun names a group: team, committee, family, class, staff, government, audience. In British English, you can use a singular verb when the group acts as one (The team is ready) or a plural verb when you think of the members separately (The team are arguing).

17.Plurals of Letters, Numbers and Abbreviations

• Abbreviations: add -s with no apostrophe: MPs, CDs, PhDs.
• Decades: the 1990s, not the 1990's.
• Surnames: the Smiths, not the Smith's.
• Single letters: an apostrophe may be used for clarity: mind your p's and q's, two A's.
• Words as words: the dos and don'ts, the ifs and buts.

18.Common Mistakes with Singular and Plural