Breakdown of Ana llegó cansada a casa.
la casa
the house / home (also "at home")
llegar
to arrive
cansado
tired
a
to
Questions & Answers about Ana llegó cansada a casa.
Why do we use the adjective cansada here instead of an adverb to describe how she arrived?
In Spanish, when you want to describe the state or condition of the subject while they perform an action, you use an adjective that agrees with the subject in gender and number. This is called a predicative complement. English sometimes does this, like in this sentence, but Spanish uses it much more frequently.
Why is it a casa and not en casa?
The verb llegar implies motion or direction towards a destination, so it always pairs with the preposition a. Even though we might say arrived at home in English, Spanish treats it as a movement to the house. You use en casa for a static location, like Ana está en casa.
Why is there no article before casa?
When referring to one's own home, Spanish omits the definite article, just like English does with the word home. If you said a la casa, it would mean to the house, referring to a specific physical building rather than her personal home.