In Spanish, adjectives need to match the nouns they describe. This means they must agree in gender and number. Let’s break it down:

1. Gender Agreement:

• Masculine: Adjectives usually end with -o.
  • Example: "niño alto" means "tall boy."
• Feminine: Adjectives usually end with -a.
  • Example: "niña alta" means "tall girl."

2. Number Agreement:

• Singular: Use the regular form of the adjective.
  • Example: "libro interesante" means "interesting book."
• Plural:
  • If the adjective ends with a vowel, just add -s.
  • If it ends with a consonant, add -es.
  • Example: "libros interesantes" means "interesting books."

3. Combining Gender and Number:

• For masculine plural, say "niños altos," which means "tall boys."

• For feminine plural, say "niñas altas," which means "tall girls."

So, remember: in Spanish, adjectives always need to match the noun in both gender and number!