Questions & Answers about Syn biegnie do zjeżdżalni, a potem woła mnie z samej góry.
Syn is in the nominative case because it is the subject of the sentence — the person doing the action.
- syn = son (subject form)
- syna can be genitive or accusative in other contexts
- synem = instrumental
In Syn biegnie..., the son is the one who runs, so nominative is required.
Biegnie is the 3rd person singular present tense of biec (to run).
It matches syn because syn is:
- 3rd person = he
- singular = one person
So:
- ja biegnę = I run / am running
- ty biegniesz = you run
- on / syn biegnie = he / the son runs
In Polish, the present tense often covers both English runs and is running, depending on context.