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Questions & Answers about La casa es amarilla.
Why is it amarilla instead of amarillo?
Adjectives in Spanish change their endings to match the noun they describe. Because casa (house) is a feminine noun, the base word for yellow, amarillo, changes its ending to match and becomes amarilla.
If I want to say 'the yellow house', does the word order change?
Why do we use es instead of está for 'is'?
How do we know casa is a feminine noun?
Most Spanish nouns that end in the letter -a, like casa, are feminine. That is why it uses the feminine word for 'the' (La) and forces the adjective to also end in -a (amarilla).