Learn Hardcore Croatian: On je voli.

On = he (subject pronoun, nominative singular)
je = her (unstressed/clitic direct object pronoun, accusative singular; variant: ju)
voli = loves/likes (3rd person singular present of voljeti “to love”)

So the sentence structure is Subject + clitic object + verb.

Why is je in the middle of the sentence?

Because je is a clitic (an unstressed short pronoun). Croatian clitics prefer the “second position” in the clause, usually right after the first stressed word or phrase. In On je voli, the first stressed word is On, so the clitic je comes next.

Can I say On voli je?

No, not in a neutral declarative sentence. The clitic should not be placed after the verb unless the verb is the first stressed element (e.g., Voli je.). Correct options include:

On je voli.
Voli je.
On ju voli. (using the variant ju)

What’s the difference between je and ju for “her”?

Both are standard clitic forms for the 3rd person feminine accusative (“her”). In Croatia, ju is very common; je is also correct and common across B/C/S. Many speakers choose ju to avoid confusion with je “is.” In practice you can use either: On je voli or On ju voli.

Does je here mean “is”? How can I tell?

Here je means “her,” not “is.” You can tell because it’s followed by a finite verb (voli). The form je meaning “is” (3rd person singular of biti, “to be”) is used in sentences like:

On je sretan. = He is happy. (adjective after “je”)
On je volio. = He loved. (past participle after “je”) You wouldn’t say “He is loves,” so je cannot be “is” in On je voli.

Can I drop the subject On?

Yes. Croatian is a pro‑drop language. You can say Voli je. The verb ending already shows it’s 3rd person singular, so the subject pronoun is optional unless you need emphasis or contrast.

How do I emphasize “her” specifically?

Use the stressed (full) form nju and/or front it:

On nju voli. = He loves her (as opposed to someone else).
Nju on voli. = It’s her that he loves. Don’t combine the clitic and the full form together in standard usage for the same object (avoid: ✗ On je nju voli).

What other word orders are possible and what do they imply?

On je voli. Neutral.
Voli je. Neutral (subject dropped).
On nju voli. / Nju on voli. Focus on “her.”
Samo on je voli. = Only he loves her. Clitic still seeks the second position after the first prosodic unit (here, the phrase “Samo on”).

How do I make a yes–no question?

Common ways:

Voli li je (on)? = Does he love her? (neutral/formal in Croatian)
On je voli? (rising intonation; common in speech)
Da li je voli? is widely understood; more typical in Serbian/Bosnian; in Croatian it’s acceptable but less formal. Avoid using Je li with a non-biti verb here (don’t say: ✗ Je li je voli?).

How do I negate it?

Place the clitic before the negated verb:

On je ne voli. = He doesn’t love her.
With no subject: Ne voli je. / Ne voli ju. Avoid: ✗ On ne voli je (the clitic prefers the pre‑verbal clitic slot in negation).

Where does the clitic go if I add adverbs like “always,” “really,” “often”?

Clitics still seek second position after the first stressed element:

On je uvijek voli. = He always loves her.
Stvarno je voli. = He really loves her.
Danas je on voli. = Today he loves her. (Here “Danas” is the first element; the clitic still comes second.)

Can a clitic begin a sentence?

No. Clitics like je/ju cannot be sentence‑initial. They need a host and typically appear in second position.

Is voli “love” or “like”?

Both, depending on context:

With people, voljeti generally means “to love.”
With things/activities, it can mean “to like”: Volim kavu. = I like coffee. For “(to) like (someone)” in the sense of “find attractive/like as a crush,” Croatian commonly uses sviđati se + dative:
Ona mu se sviđa. = He likes her.

Why is the object in the accusative case?

Because voljeti takes a direct object. Direct objects in Croatian are in the accusative:

On je voli. (je/ju = accusative clitic)
On voli nju. (nju = accusative full form)

How would this change with different objects (him, them, it)?

Him/it (masc./neut. sg.): ga → On ga voli.
Her (fem. sg.): je/ju → On je/ju voli.
Them (pl., any gender): ih → On ih voli.

Can I use both a noun and the clitic at the same time (clitic doubling)?

Not in standard Croatian with direct objects. Use either:

On je voli. (clitic)
On voli Mariju. (full noun) If you front the object for emphasis, you still don’t add the clitic: Mariju on voli.

What about imperatives or infinitives—does the clitic still go second?

With positive imperatives and infinitives, clitics often attach after the verb:

Voli je! = Love her!
Voljeti je nije lako. = To love her is not easy. In multi‑verb constructions, placement can vary; follow your textbook or trusted examples for those patterns.

Any regional notes I should be aware of?

je vs ju: Both are correct; ju is especially common in Croatia, je is very common across B/C/S. You’ll hear both.
Yes–no questions: Voli li…? is the neutral Croatian pattern; Da li…? is very common in Serbian/Bosnian and also heard in Croatia, though less formal.