This is the 80th most frequent Polish word.
zostanie
"Zostanie" means "will become" or "will remain" in English, depending on context.
Here, "zostanie" is used as the future tense form of the verb "zostać" to indicate a promise of remaining in a place.
Obiecał, że zostanie z nami na cały wieczór.
He promised he would stay with us for the entire evening.
Here, "zostanie" is used to generate a formal future passive construct, emphasizing the completion of an action in the future.
Zostanie to zrobione jak najszybciej.
It will be done as soon as possible.
Here, "zostanie" is used as the future tense passive form of the verb "zostać" to denote something that will happen.