This is the 9139th most frequent Korean word.
거야
A contraction of "거예요," meaning "it is" or indicating future intention as "will" (context-dependent).
거야 is used to indicate a future event or action.
내일 비가 올 거야.
It will rain tomorrow.
거야 is used to express an obligation or necessity.
그 책을 읽어야 할 거야.
You should read that book.
거야 is used to express an assumption or belief about a situation.