In Spanish, adjectives agree in both number and gender with the nouns they describe.
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Gender: Spanish nouns are categorized as either masculine or feminine. Masculine nouns typically end in -o, while feminine nouns usually end in -a. Adjectives must match the gender of the nouns they modify. For example, "niño alto" (tall boy) uses a masculine adjective "alto," while "niña alta" (tall girl) uses the feminine form "alta."
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Number: Nouns in Spanish can be singular or plural. To agree with the noun's number, adjectives also change form. For singular nouns, the adjectives are used in their base form (e.g., "el perro negro" - the black dog). For plural nouns, adjectives typically take on an -s or -es ending, such as "los perros negros" (the black dogs).
In summary, both gender and number require adjectives to adapt their forms in accordance with the nouns they describe, thereby maintaining grammatical agreement in Spanish.