Grammar Linguistics

How To Form the Plural of Spanish Words Ending in -o

Learning plurals in Spanish has become way easier than you’d think. Previously, there were two rules and several exceptions for the formation of plurals of words ending in -o. Nowadays, there is only one rule. 

Learn the rule for Spanish plurals

Nouns and adjectives ending in -o will take an -s to form the plural. It’s as simple as that. This means that all the words used to name entities, or nouns, and those used to describe such entities, otherwise known as adjectives, become plural simply by adding on an -s.

Here’s an example:

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Notice how the noun círculo and the adjective blanco take an -s in their plural forms cículos blancos. Remember to form the plural in both words, since these must agree in number.

Note: This plural agreement in Spanish differs from the English language, where adjectives do not take plural forms.

 Now, let’s consider these sentences:

Again, here we can see that the noun número takes an -s to form the plural números. Notice also how the article is also in the plural form los. Plural agreement between the elements of a sentence is a very important characteristic of the Spanish language, and we cannot emphasize this enough.

The following sentences will easily show how the nouns and adjectives change from singular to plural by just adding an -s at the end:

And that’s it: one simple rule to remember them all!

Written by Isabel Matos

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