This is the 2285th most frequent Catalan word.
estàs
"Estàs" means "you are" (singular, informal, second person) in English.
Here, 'estàs' is used as the second person singular of 'estar', indicating the current state of being tired.
Estàs molt cansat avui.
You are very tired today.
In this sentence, 'estàs' expresses the present condition of the person being addressed, asking about their quietness.
Per què estàs tan silenciós?
Why are you so quiet?
Here, 'estàs' combines with the present participles 'estudiant' (studying) and 'descansant' (resting) to describe what the person is currently doing.