Breakdown of Ktoś kopnął go w nogę.
on
he / it (m)
ktoś
somebody
noga
leg, foot
w
into (direction, + Accusative)
Questions & Answers about Ktoś kopnął go w nogę.
How does the suffix in kopnął change the meaning compared to the base verb kopać?
The suffix -nąć (seen here in the past tense form kopnął) makes the verb perfective and specifically semelfactive. This means it describes a single, instantaneous action. While kopać means to kick generally or repeatedly, kopnąć means to deliver exactly one quick kick.
Why do we use the short pronoun go here instead of the long form jego?
We use the short, unstressed form go because there is no special emphasis on "him" in this sentence. If you wanted to stress that someone kicked HIM (and not someone else), you would use the stressed form jego.
"In the leg" sounds like a location. Why is nogę in the accusative case here instead of the locative?
Even though the English translation uses "in", the Polish preposition w takes the accusative case here because it expresses the direction or target of a physical impact, similar to motion towards a destination. If you used the locative (w nodze), it would mean something was physically resting inside the leg.
Does the -ną- element of a semelfactive verb always stay in the past tense, as it does in kopnął?