Breakdown of Купи билет, а то полиция оштрафует.
билет
ticket
купить
to buy (perfective)
полиция
police
а то
otherwise
Questions & Answers about Купи билет, а то полиция оштрафует.
Why use а то here instead of just или for "or"?
While или introduces a neutral alternative, а то specifically indicates a negative consequence, meaning "otherwise" or "or else." Using или here would sound strange, almost as if buying a ticket and getting fined are two equal choices you can pick between, rather than a direct warning.
The English translation says "will fine you", but there's no Russian word for "you" (тебя) here. Why?
Russian frequently drops pronouns when the context makes the object obvious. Because the first half of the sentence uses the familiar imperative command Купи addressed to "you", it is completely understood that you are the one who will be fined. Adding тебя would be grammatically correct but dropping it makes the warning punchier and more natural.
Why use the perfective verb оштрафует instead of the imperfective future будет штрафовать?
The consequence being threatened is a single, completed future event: being issued a fine. If you used the imperfective future, it would imply the police will spend time continuously in the process of fining you, which sounds unnatural for a simple warning.
Since билет is the direct object being bought, shouldn't it have an accusative case ending?
It is in the accusative case! Remember that for masculine inanimate nouns like билет, the accusative form is identical to the nominative. It would only take an ending if it were an animate noun (like a person or animal) or if the sentence required the genitive case.