As in English, the plural is generally formed by adding an -s to the singular form of the noun. Please note that the -s is pronounced.
Generally, to form plurals, you can follow these rules:
- Add an –s. Example: la silla/las sillas (the chair/the chairs)
- For nouns that end in a consonant, add an –es. Example: el reloj/los relojes
- For nouns ending in –z, the –z changes to –c. Example: el lápiz/los lápices
Keep in mind that there are exceptions and that not all nouns follow the rules above.