Word
Nie mogłem przekroczyć granicy, bo miałem w plecaku dziwny przedmiot.
Meaning
I couldn't cross the border because I had a strange item in my backpack.
Part of speech
sentence
Pronunciation
Course
Breakdown of Nie mogłem przekroczyć granicy, bo miałem w plecaku dziwny przedmiot.
mieć
to have
nie
no / not
w
in / on (a day)
plecak
backpack
Questions & Answers about Nie mogłem przekroczyć granicy, bo miałem w plecaku dziwny przedmiot.
Why do we use the perfective przekroczyć here after nie mogłem instead of the imperfective przekraczać?
This is the core rule for negated modals! We use nie móc with a perfective verb when it expresses a circumstantial inability to do something on a specific occasion (you tried, but were physically stopped from crossing). If you used the imperfective przekraczać, it would sound like a rule or prohibition, meaning you weren't allowed to cross or were supposed to avoid crossing.
The verb przekroczyć normally takes the accusative case. Why is the border in the genitive case (granicy) here?
This is the Genitive of Negation at work. Even though the negative word nie is attached to the modal verb (mogłem), its grammatical effect cascades down to the direct object of the following infinitive. Because you couldn't cross it, the border is forced into the genitive case instead of its usual accusative.
If the negation makes the border genitive, why is dziwny przedmiot in the accusative case instead of the genitive?
The Genitive of Negation only affects the objects within the same clause as the negated verb. The conjunction bo (because) starts a brand new, affirmative clause. Since the verb miałem (I had) is positive, its object remains in the standard accusative case.
How does the prefix prze- change the meaning of the base verb in przekroczyć?