Answering with lo (lo estoy)

Yes, I Am — the Spanish Way

English answers Are you tired? with just Yes, I am. Spanish cannot stop after the verb: ser, estar, and parecer need something to lean on. Instead of repeating the adjective, Spanish replaces it with the neuter pronoun lo:

Are you tired? Yes, I am.
¿Estás cansada? Sí, lo estoy.

Literally: "Yes, I am it." Repeating the adjective (Sí, estoy cansada) is grammatical but heavy — lo is what a native speaker says.

With Estar

Are you all ready? Yes, we are.
¿Están listos? Sí, lo están.
Are you sure about the answer? I am.
¿Estás seguro de la respuesta? Lo estoy.

Notice the last answer: the can even drop — Lo estoy is a complete, confident answer.

With Ser — Adjectives and Nouns Alike

Lo also stands in for what someone or something is — including a noun:

Are you the manager? Yes, I am.
¿Es usted el gerente? Sí, lo soy.
Is this restaurant new? Yes, it is.
¿Este restaurante es nuevo? Sí, lo es.
My mother was very calm; my father was not.
Mi madre era muy tranquila; mi padre no lo era.

With Parecer

The contrast between how things seem and how they are is where this pronoun shines:

It seems easy, but it is not.
Parece fácil, pero no lo es.
The doctor seems nervous today, but he is not.
El médico parece nervioso hoy, pero no lo está.

Always Lo — Never La, Los, Las

This lo is invariable. It does not agree with anything:

refers back topronoun
cansadalo
listoslo
el gerentelo

¿Estás cansada? — Sí, la estoy is impossible: the answer is always lo.

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