Breakdown of Mężczyzna nie mógł przekroczyć granicy bez paszportu.
nie
no / not
mężczyzna
man
paszport
passport
móc
to be able to
granica
border
bez
without
przekroczyć
to exceed (perfective)
Questions & Answers about Mężczyzna nie mógł przekroczyć granicy bez paszportu.
Why is the perfective verb przekroczyć used here? Doesn't the negated nie mógł usually require an imperfective verb?
Not always! When nie móc expresses a strict circumstantial inability to complete a specific action (he didn't have a passport, so it was physically or legally impossible), it takes a perfective infinitive like przekroczyć. We only default to the imperfective after nie móc when expressing a prohibition ("not allowed to") or an ongoing, repeated inability.
How would the meaning change if the sentence used the imperfective przekraczać instead?
Why is the border in the Genitive case (granicy) instead of the Accusative (granicę)?
This is the Genitive of Negation at work. Even though the direct object technically belongs to the infinitive przekroczyć (which normally requires the Accusative), the main verb mógł is negated (nie mógł). This negation "reaches across" the infinitive and forces the direct object into the Genitive case.
If this was a single, completed failure to cross the border, why is the past tense verb mógł imperfective?
Modal verbs like móc (can/could), musieć (must), and chcieć (want) are almost always imperfective in Polish. They describe the state of ability, necessity, or desire, which is treated as an ongoing background state. The "single, closed event" meaning comes entirely from pairing it with the perfective infinitive przekroczyć.
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