Questions & Answers about Dyrygent zaczyna próbę.
Because próbę is in the accusative case, which is used for the direct object of the verb.
- Dictionary form: próba
- Accusative singular: próbę
In Dyrygent zaczyna próbę, the thing being started is the rehearsal, so próba changes to próbę.
This is a very common pattern for feminine nouns ending in -a:
- książka → książkę
- kawa → kawę
- próba → próbę
Zaczyna is the 3rd person singular present tense form of the verb zaczynać, meaning to begin / to start.
So:
- ja zaczynam = I begin
- ty zaczynasz = you begin
- on / ona / ono zaczyna = he / she / it begins
Since dyrygent is he grammatically, zaczyna means he begins / starts.