Questions & Answers about Ona pliva najbrže jer ima trening svaki dan.
How do we form the superlative adverb najbrže?
Adverbs generally form their comparative by adding an ending like -e to the root, and the superlative by adding the prefix naj- to that comparative form. For the base adverb brzo (fast), the comparative is brže (faster), and the superlative is najbrže (the fastest).
Najbrže looks like a neuter adjective. How do we know it is an adverb here?
You are right! Najbrže is also the neuter singular form of the adjective (like in najbrže auto - the fastest car). Here, it doesn't describe a noun. It describes how she swims (pliva), which makes it an adverb. In Croatian, most adverbs share the exact same form as the neuter singular adjective.
What case is trening in this sentence?
It is in the accusative case because it is the direct object of the verb ima (she has). Since trening is a masculine inanimate noun (a concept or thing, not a person or animal), its accusative form looks exactly the same as its dictionary (nominative) form.
Why is the phrase svaki dan used here without a preposition?
In Croatian, you can express frequency, routine, or duration by putting a time phrase directly into the accusative case without any preposition. Svaki dan is in the accusative case and translates simply to "every day".