Breakdown of Moram napisati izvještaj do roka.
morati
must
do
to, until, up to / in the mood for (nije mi do)
napisati
to write (perfective)
izvještaj
report
Questions & Answers about Moram napisati izvještaj do roka.
Why is napisati used here instead of pisati?
Pisati is an imperfective verb focusing on the ongoing process of writing. By adding the prefix na-, it becomes the perfective verb napisati, which means to completely finish writing something. Because you need to have the report completed by the deadline, you must use the perfective form here.
Izvještaj is the object being written. Why doesn't its ending change?
It actually is in the accusative case, but you can't tell just by looking at it! Izvještaj (report) is a masculine noun. Because it is an inanimate object (non-living), its accusative form is identical to its basic dictionary form. Only living masculine nouns get an -a ending in the accusative.
Why does the word rok (deadline) become roka?
The preposition do (meaning "by" or "until" in this context) always requires the noun that follows it to be in the genitive case. For regular masculine nouns like rok, you form the genitive by adding -a, making it roka.
Why do we use the full infinitive napisati after moram?
When you use a modal verb like morati (must or have to), the main action verb that follows it stays in its basic infinitive form. Here, moram is conjugated for "I", and napisati simply stays in the infinitive, very similar to saying "I must write" in English.