This is the 4749th most frequent Russian word.
закончиться
"Закончиться" - to come to an end; to finish; to be over.
The reflexive form of the verb 'закончить' is used to indicate that the event (a lesson) came to its conclusion.
Урок закончился в шесть часов.
The lesson finished at six o'clock.
The reflexive form of the verb 'закончить' in future tense indicates the expected conclusion of an event in the future.
Фильм закончится через пятнадцать минут.
The movie will end in fifteen minutes.
The reflexive form of the verb 'закончить' in this interrogative sentence is used to inquire about the potential termination of an ongoing natural event.