Questions & Answers about Cena roste každý rok.
Roste is the correct 3rd person singular present-tense form of the verb růst (to grow / to rise).
Since cena is a singular noun and means the price, Czech uses the he/she/it form of the verb:
- já rostu = I grow
- ty rosteš = you grow
- on / ona / ono roste = he / she / it grows
Here, cena is grammatically feminine singular, so it takes roste.
Because cena is the subject of the sentence, it is in the nominative case.
The basic dictionary form is:
- cena = price
In this sentence, the price is the thing that is rising, so nominative is exactly what you expect.