Express the idea of 'only', 'no other option but', 'nothing else but'.
Long explanation:
The ~しかない grammar point is used to emphasize that there are no other options or possibilities, and the subject must follow a specified action or state. It can be translated as 'only', 'no other option but', or 'nothing else but' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.