Plural nouns: rules and common exceptions

Countable nouns distinguish between a single person or item and a group. When you mention one object, you use the singular form without any extra endings. When you refer to two or more items, the noun must change to its plural form. Words that express quantity, like several, many, and four, tell the reader immediately that a plural noun must follow.

The standard way to make an English noun plural is by adding -s to the singular base. This rule applies to ordinary words such as email, desk, key, and photo. Never use an apostrophe to form a regular plural noun. An apostrophe indicates possession or a contraction, so writing email's instead of emails is an error.

Você pode praticar isso novamente em English Plurals: Rules and Common Exceptions e Proper Nouns: Capitalization Rules and Uses.

When a noun ends in -s, -ss, -sh, -ch, -x, or -z, adding only -s makes the word difficult to pronounce. English solves this by adding -es, which creates an extra syllable pronounced as /ɪz/. Common examples include buses, classes, dishes, watches, and boxes. Listen for the extra beat in the word whenever you speak or write these plurals.

Before you make a noun ending in y plural, examine the letter directly in front of it. If a consonant comes before y, change the y to i and add -es, as seen in city becoming cities and factory becoming factories. If a vowel comes before y, simply add -s, as in day becoming days and holiday becoming holidays.

Certain nouns ending in -f or -fe change their ending to -ves in the plural form. Familiar examples include half becoming halves, leaf becoming leaves, knife becoming knives, and shelf becoming shelves. However, this shift does not apply to every word ending in f. Nouns like roof and chef follow the regular pattern and simply add -s to become roofs and chefs.

Some everyday nouns do not accept regular endings at all. Instead, they change internal vowels or take unique historical endings. Foot changes to feet, tooth becomes teeth, man becomes men, and woman becomes women. Similarly, child becomes children, and person usually becomes people in ordinary conversation. Learn these words as paired vocabulary items rather than looking for a general rule.

A small group of countable English nouns has identical singular and plural spellings. Words like sheep, deer, fish, and aircraft do not change when you count multiple units. You determine whether the word is singular or plural by looking at accompanying numbers, determiners, or verb agreements elsewhere in the sentence.

Be careful not to confuse plural countable nouns with uncountable nouns or plural-only nouns. Words like information, luggage, and advice never take a plural -s, even when they describe a large volume. In contrast, paired items like scissors, glasses, and trousers are always plural and require plural verbs. Checking whether a noun can be counted directly prevents common errors.