Special plurals: virus, crisis, menús...

Plurales especiales: virus, crisis, menús...

Algunas palabras forman el plural de manera especial.

(Some words form the plural in a special way.)

Teacher explanation

What’s special here: plural of “foreign-looking” nouns and letters

These are common in professional Spanish (IT, media, business, academia): Latin/Greek nouns (virus, crisis), French loans (menú), and words ending in a stressed vowel (maniquí, tabú).

They don’t always follow the “normal” plural pattern, so it’s worth memorising them as mini-groups.

Quick decision guide (2-step check)

Look at the final sound and the stress (accent mark).
- Ends in -s and is a Greek/Latin form → often invariable (crisis, virus).
- Ends in a stressed vowel (á, é, í, ó, ú) → plural can be -s or -es depending on the word.
Then confirm the group: invariable / +-s / +-es.

Group 1: invariable (singular = plural)

Some nouns keep the same form in singular and plural. Only the article and other words change.

Singular	Plural	Notes
la crisis	las crisis	~~crisises~~ / ~~crises~~ in Spanish
el virus	los virus	~~viruses~~ in Spanish (English influence)

Correct: Hay varias crisis de tráfico.
Correct: El informe menciona varios virus informáticos.

Group 2: plural with -es (stressed -í / -ú in these words)

Some words ending in stressed -í or -ú add -es.

Singular	Plural	Common mistake
el maniquí	los maniquíes	~~maniquís~~
el tabú	los tabúes	~~tabús~~

Correct: En el curso usaron dos maniquíes.
Correct: En algunas empresas todavía hay tabúes sobre salud mental.

Group 3: plural with -s (other stressed vowels, typical loans)

Other words ending in a stressed vowel often take -s (very common with everyday loanwords).

Singular	Plural	Common mistake
el menú	los menús	~~menúes~~
el champú	los champús	~~champúes~~

Correct: Nos ofrecieron dos menús (normal y sin gluten).

Very short words: sometimes two plurals are possible

Some very short words (often monosyllables) can have two accepted plurals, depending on meaning, register, or regional preference.

tos → tos / toses
gas → gas / gases

Tip: if you want the safest “textbook” option, -es (toses, gases) is usually clearer in writing.

Plural of letters (when you talk about the characters)

When A, Í, K, B are used as names of letters, Spanish pluralises them like nouns.

Singular	Plural
una A	unas aes
una Í	unas íes
una K	unas kas
una B	unas bes

Correct: En el formulario escribe dos aes y tres bes.

Meaning changes in plural (not just “more than one”)

Some nouns can shift meaning when pluralised. Don’t translate mechanically.

muralla = a specific wall structure

murallas = the city’s defensive walls as a system / the whole set
escalera = a specific staircase (physical object)

escaleras = stairwell / the stairs as an area or access between floors

Self-check: what should change when you make the sentence plural?

Articles: el/la → los/las; un/una → unos/unas
Adjectives and verbs: must agree in number (and gender when relevant).
The noun form: check if it is invariable (virus/crisis) or needs -s / -es.

Mini test: If the noun looks “unchanged”, ask: Did I at least change the article/adjective/verb?

Very short words (i.e., monosyllables) have two plurals (tos ⇒ toses / tos; gas ⇒ gases / gas)
Some words do not change from singular to plural.
Some words form the plural with -s and others with -es.

Caso

Singular

Plural

La palabra no cambia (The word doesn’t change)

Virus (Virus)

Crisis (Crisis)

Virus (Virus)

Crisis (Crisis)

-es

Maniquí (Mannequin)

Tabú (Taboo)

Maniquíes (Mannequins)

Tabúes (Taboos)

-s

Champú (Shampoo)

Menú (Menu)

Champús (Shampoos)

Menús (Menus)

Vocales y consonantes (Vowels and consonants)

A, Í

K, B

Aes , Íes

Kas, Bes

Exceptions!

Muralla ⇒ muro concreto; Murallas ⇒ todas la defensas de una ciudad.
Escalera ⇒ estructura concreta; Escaleras ⇒ zona o acceso entre pisos.

Exercise 1: Multiple choice

Instruction: Choose the correct answer

1. La grúa puede tardar más si hay varias ____ de tráfico por las obras en la M-30.

2. En la sala de espera nos ofrecieron dos ____ mientras terminaban la revisión anual.

3. Tras el accidente, el informe menciona varios ____ informáticos en la centralita del coche de sustitución.

4. En el parte de la revisión aparecen dos ____ que se usaron para probar los cinturones en el curso de seguridad vial.

Exercise 2: Rewrite the phrases

Instruction: Rewrite each sentence in the plural, changing only what is necessary (article, adjectives and the special plural of the noun: virus/crisis do not change; maniquí/tabú → -es; champú/menú → -s; letters: A/Í/K/B → aes/íes/kas/bes).

Show/Hide translation Show/Hide hints

Este virus ha obligado a la empresa a actualizar el protocolo de viajes.

⇒ ____________________________________________________________________________________________________ Example
Estos virus han obligado a la empresa a actualizar el protocolo de viajes.
(These virus have forced the company to update the travel protocol.)
La crisis se nota en el departamento de ventas.

⇒ ____________________________________________________________________________________________________ Example
Las crisis se notan en el departamento de ventas.
(The crisis are noticeable in the sales department.)
El maniquí nuevo está en el escaparate principal.

⇒ ____________________________________________________________________________________________________ Example
Los maniquíes nuevos están en el escaparate principal.
(The new mannequins are in the main shop window.)
Ese tabú dificulta una conversación abierta en el equipo.

⇒ ____________________________________________________________________________________________________ Example
Esos tabúes dificultan una conversación abierta en el equipo.
(Those taboos make an open conversation in the team difficult.)

Exercise 3: Multiple Choice

Instruction: Choose the correct sentence.