Spanish · Chapter 2 · Lesson 20 · Grammar primer
Noun plurals: la casa, las casas
From la casa to las casas: the three rules that pluralise every noun you know.
The short version
The nouns that never change in the plural
Multi-syllable nouns ending in an unstressed -s are identical in singular and plural, and the article carries the entire distinction. It also carries meaning: el lunes is 'on Monday', los lunes is 'on Mondays'. Stress that final syllable and the rule flips back to normal, so el mes becomes los meses.
el lunes, los lunes
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