Clitic Placement with Infinitives and Modals

By the time you reach this page you already know the iron law: the clitic cluster sits in second position, right behind the first stressed unit of the clause. Complex predicates — a modal or a phasal verb plus a dependent infinitive (moram reći, želim vidjeti, počinjem razumjeti) — put that law under pressure, because the object pronoun logically belongs to the infinitive, yet the second position belongs to the whole clause. Croatian resolves this with a phenomenon linguists call clitic climbing: the clitic leaves the infinitive it semantically depends on and "climbs" up to second position of the matrix clause. Getting this right is the difference between sounding like a textbook and sounding like a native.

The core fact: one clause, one clitic slot

A modal-plus-infinitive sequence in Croatian forms a single clause — there is one finite verb (the modal) and the infinitive is its complement. Because it is one clause, it has one second-position slot, and every clitic in it goes there, regardless of which verb it "belongs" to. The object of the infinitive does not wait next to the infinitive; it jumps to the front.

Notice how counterintuitive this is for an English speaker. English keeps the pronoun glued to its own verb: I have to tell you, I want to see him. There is no impulse in English to pull "you" or "him" up to the front of the sentence. In Croatian that impulse is the rule.

The auxiliary climbs too

This is not just about object pronouns. In compound tenses the auxiliary clitic climbs over the modal as well. When you put a modal-plus-infinitive into the past or future, the sam/ćeš/bih lands in second position, not next to the infinitive.

That last example is worth pausing on: there are three verbal elements — future neću, modal moći, infinitive pomoći — and still only one clitic, ti, climbing all the way to the front. The whole tower of verbs is one clause.

Fronting resets position one

The second-position rule never stops being about position one. If you front the infinitive or its object for emphasis, that fronted element becomes position one, and the cluster follows it instead of the modal.

These are not exotic. Fronting the infinitive is a normal, emphatic device in Croatian — it pulls the action into focus. The clitic simply obeys its usual master, the front of the clause, wherever that front now is.

The da-clause alternative: two clauses, two slots

Here is where dialect and register enter. Alongside the infinitive construction, the South Slavic area has a da + present construction (moram da kažem instead of moram reći). The crucial structural fact is that moram da kažem is two clauses, not one — and therefore it has two second-position slots.

In the da-construction the subordinator da opens the second clause and the clitic attaches right after it — da ti kažem — because da itself counts as position one of its own clause (see clitics with fronting and conjunctions).

What never happens: the clitic stranded by the infinitive

The single most common learner error is to leave the clitic next to the infinitive, where the meaning seems to put it. That violates the second-position rule outright — inside a one-clause modal construction there is nothing for a clitic to lean on between the modal and the infinitive in neutral order, so it must climb.

The only time a clitic legitimately sits after the infinitive is when the infinitive has itself been fronted to position one (Reći ti moram) — and then it is not "stranded", it is hosting the cluster from the front.

Common Mistakes

Key Takeaways

• A modal (or phasal verb) + infinitive is one clause with one second-position slot.
• The object clitic of the infinitive climbs to that slot — second position of the matrix clause: Želim ga vidjeti, Moram ti reći.
• The auxiliary climbs too in compound tenses: Morao sam mu sve objasniti, Neću ti moći pomoći.
• Fronting the infinitive or object resets position one, and the cluster follows the fronted element: Reći ti moram.
• The da + present alternative (moram da ti kažem) is two clauses with the clitic in the da-clause — grammatical but (regional: eastern); standard Croatian uses the climbing infinitive.
• Never strand the clitic next to the infinitive in neutral order (✗ Moram reći ti).