The plural of nouns

1. What is the plural in Spanish and why does it matter?

• In Spanish, the plural is always visible in two places:
  • on the article: el / la → los / las
  • on the noun: usually by adding -s or -es
• For body parts, you almost always talk in plural in real life: two eyes, two hands, etc.
• So you need to be able to switch quickly:
  • el ojo → los ojos
  • la mano → las manos

2. The basic pattern: vowel → +s

Look at the last letter of the noun in singular.

• If it ends in a vowel (a, e, i, o, u), you normally just add -s.

• Article also changes:
  • el → los
  • la → las

Mini check: Can you form the plural?

• el brazo → … → los brazos
• la oreja → … → las orejas

3. Nouns ending in a stressed vowel (including pie)

• If the noun ends in a stressed vowel (you hear the stress clearly at the end), you still add -s.
• In this unit you see:
  • el pie → los pies

Important:

• Do not write piees or pieses.
• Just one e + s: pies.

4. Nouns ending in a consonant → +es

• If the noun ends in a consonant (not a, e, i, o, u), you add -es.

Accent change:

• Some words with a written accent (tilde) lose it in the plural:

• For A1 it is enough to copy the correct form you see in the book and start to recognize this pattern.

5. Nouns ending in -z → -ces (irregular pattern)

• Nouns ending in -z are a very common doubt for learners.
• The rule: z → c + es in the plural.

Typical errors to avoid:

• la nariz → las narizs ✘
• la nariz → las narizes ✘
• Only: la nariz → las narices ✔

Visual tip

• When you see a noun ending in -z, imagine you erase the z and write ces:
• nariz → nari + ces → narices

6. Special case: words that do not change in the plural

• Some body-related nouns of Latin/Greek origin stay the same in singular and plural.
• In this unit you see: el iris.

• The plural is marked only by the article (el → los), not by the noun ending.
• So avoid forms like los irises.

7. Articles and plural: always move together

In Spanish, the article and the noun must agree in number (singular/plural) and gender (masculine/feminine).

Self-check questions:

• Is my article plural? los / las
• Is my noun plural as well? -s / -es / -ces / same form
• Is the gender consistent? (masculine with los, feminine with las)

8. Singular vs plural with pain: Me duele / Me duelen

This is a very practical point, often confusing at first.

• Use Me duele + singular noun.
• Use Me duelen + plural noun.

Think like this:

• 1 part of the body → Me duele
• 2 or more parts → Me duelen

9. Step-by-step: how to form a plural quickly

1. Find the article.
   • Is it el or la? Then you will probably need los or las.
2. Look at the last letter of the noun.
   • Vowel (a, e, i, o, u) → add -s.
   • Consonant (other letter) → add -es.
   • Ends in -z → change to -ces.
   • Check if it is a special form that does not change (e.g. iris).
3. Change the article.
   • el → los
   • la → las
4. Read the whole group aloud.
   • Does it sound like plural? Does every word look plural?

10. Final self-check: can you do this now?

Without looking at the rules, can you:

• Explain in one sentence when you add -s and when you add -es?
• Write the plural of:
  • el cuello → los cuellos
  • la nariz → las narices
  • el corazón → los corazones
  • el pie → los pies
  • el pulmón → los pulmones
  • el iris → los iris
• Say both versions with pain:
  • Me duele el pie. / Me duelen los pies.
  • Me duele la pierna. / Me duelen las piernas.

If you can do this, you are ready to use these plurals in conversation and focus in class on speaking, not on rules.