Questions & Answers about On se želi sastati s njom.
How do we get njom from the word for "she" (ona)?
njom is the instrumental case form of ona (she). Whenever you do an action with someone, you use the preposition s (or sa) followed by the instrumental case. So, "with her" becomes s njom.
Why does it use s njom instead of sa njom?
The main preposition for "with" is actually s. You only add the "a" to make it sa if the following word starts with a sound that makes s hard to pronounce (usually s, š, z, or ž). Because njom starts with the "nj" sound, s njom rolls off the tongue easily, so the extra "a" isn't needed.
Why is the word se so early in the sentence? Doesn't it belong to sastati?
Yes, the full dictionary form of "to meet up" is sastati se. However, se is a clitic (a short, unstressed word), and Croatian clitics strictly prefer the second position in a sentence. Since On (He) is the first word, se jumps into the second spot right after it, separating from sastati.
Why is sastati in its dictionary (infinitive) form here?