Both ser and estar translate to ‘to be,’ but they describe different meanings. Ser often identifies what someone or something is; estar commonly expresses location or a condition.

Details and examples
Compare ‘Ella es médica’ (She is a doctor) with ‘Ella está cansada’ (She is tired). Another useful pair is ‘La manzana es verde’ (The apple is green in color) versus ‘La manzana está verde’ (The apple is unripe).
Practical tip
Avoid relying only on the permanent-versus-temporary shortcut; it has exceptions. Learn common sentences in context, then change one word to hear how the meaning shifts.
Frequently asked question
Which verb describes the location of an event?
Events often use ser: ‘La fiesta es en casa.’ People and objects usually use estar for location.

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