Questions & Answers about On marljivo radi u uredu.
How does marljivo (diligently) relate to the adjective for "diligent"?
It is built directly from the adjective marljiv (diligent). To turn a regular adjective into an adverb, you use its neuter singular form. Because marljiv takes an -o ending for the neuter form, the adverb becomes marljivo.
Wait, isn't marljivo just a neuter adjective? How can I tell it's an adverb here?
Does the adverb marljivo have to go before the verb radi?
In Croatian, adverbs that describe how an action is done usually sit directly in front of the verb. While Croatian word order is quite flexible, placing marljivo before radi is the most natural and common way to phrase this.
Why is the word for office uredu instead of just ured?
Because it follows the preposition u (in) to describe a static location (where something is happening). This triggers the locative case. Since ured (office) is a masculine noun ending in a consonant, you add -u to make the locative form, giving us u uredu.