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Questions & Answers about Os gatos são bonitos.
Why does the word for 'the' change to os here?
Why do we use são for 'are' in this sentence?
Does the adjective always get an 's' added to it like bonitos?
Yes, when it describes a plural noun! Adjectives (describing words) must match the noun's gender and number. Since gatos is masculine and plural, the basic adjective bonito changes to its masculine plural form, bonitos.