Pronouns in Complex Sentences: Climbing, Landing, and Order

In a simple sentence, an Italian clitic has one place to live: directly before the conjugated verb. Lo vedo, gli parlo, te lo do. But in a complex sentence — one with infinitives, gerundi, modals, periphrases, or causatives — the clitic suddenly has options. Posso dirti or ti posso dire? Sto leggendolo or lo sto leggendo?

These choices are not random. Each construction has rules, and the rules sometimes conflict. This page maps the landscape: where clitics can land, where they cannot, what the choice means, and how to handle conflicts when stacks combine.

The fundamental landing rule

Clitics live in one of three places: proclitic to an inflected verb (in a finite clause), enclitic to a non-finite form (infinitive, non-progressive gerundio, tu/noi/voi imperative), or — in complex sentences with a chain — climbing to a proclitic position before the head of the chain.

Modal + infinitive: climbing optional

After modals dovere, potere, volere, sapere, the clitic has two homes: enclitic to the infinitive or proclitic to the modal. Both are fully grammatical.

Both columns are correct, native, and frequent. The climbed form (lo posso dire) feels slightly more spoken; the attached form (posso dirlo) feels slightly more measured. The choice is often euphonic.

Modals in compound tenses

When the modal is in a compound tense (ho dovuto, avrei potuto), climbed clitics go before the auxiliary; attached clitics stay on the infinitive. The intermediate position (between auxiliary and modal participle) is not allowed.

For the full theory, see Modal Perfect Constructions.

Stare + gerundio: clitics climb obligatorily

Unlike modals, the stare + gerundio progressive does not allow the attached option. Clitics must climb to before stare.

This rule is rigid. The same applies to stare + gerundio in subjunctive contexts (credo che lo stia leggendo, not credo che stia leggendolo — see Progressive in the Subjunctive).

Stare per + infinitive and aspect periphrases: climbing optional

Stare per + infinitive and the aspect periphrases (cominciare a, finire di, smettere di, continuare a) all follow the modal pattern: clitics climb or attach, both correct.

The climbed form is slightly more conversational; the attached form slightly more measured.

Independent gerundio and infinitive: clitics attach

When the gerundio is not part of stare + gerundio — when it is an independent adverbial (parlando, avendo finito) — clitics attach to the gerundio. The same applies to a bare infinitive after a preposition (dopo aver, senza dire, prima di partire).

The classic confusion: sto leggendolo (wrong) vs avendolo letto (right). The distinguishing feature is whether the gerundio is part of stare + gerundio or is an independent adverbial. After a preposition the infinitive always takes enclitic pronouns — there is no inflected verb above it to climb to within the same clause.

Imperative: tu/noi/voi attach, Lei climbs

In affirmative tu/noi/voi imperatives, clitics attach as enclitics. In negative imperatives, both placements work. In the Lei imperative (which borrows from the subjunctive), clitics are proclitic.

Tourist mistake: Dicami (with enclitic, as if Lei worked like tu) is wrong in the formal register.

Causatives fare/lasciare: clitics climb obligatorily

The causative fare + infinitive and lasciare + infinitive treat the chain as a single complex predicate. Clitics must climb to the inflected verb, never attach to the infinitive.

Perception verbs (vedere, sentire + infinitive) allow optional climbing, with climbing strongly preferred.

For the full causative pattern, see Causative fare + infinitive.

Stacked periphrases: head and tail are the safe landing spots

When you stack periphrases (see Stacked Periphrases), clitics live at the head or at the deepest infinitive. Intermediate positions are wrong.

Multi-clitic clusters: order is fixed

When clitics cluster, the order is indirect before direct, with the indirect form modified before another clitic: mi → me, ti → te, gli/le → glie- (written as one word: glielo, gliela, glieli, gliele, gliene), ci → ce, vi → ve, si → se.

These clusters move as a unit. Glielo climbs together; me ne attaches together; te lo never splits.

For the full theory, see Combined Clitics: Order.

Reflexives, locative ci, partitive ne

Reflexives, locative ci, and partitive ne follow the same placement rules as object clitics. With reflexives in modal periphrases, the auxiliary choice can flip depending on whether the clitic climbs.

When the reflexive climbs, the auxiliary is essere; when the reflexive attaches, formal Italian still prefers essere (è dovuto alzarsi) but colloquially avere is often used. Standard written Italian prefers the climbed form.

Comparison with English

English does not have clitic pronouns; its object pronouns are full words that go where any noun phrase would go. I want to see him, I am reading it, Let me know. There is no question of climbing or attaching, because there are no clitics.

This means English-speaking learners have nothing to transfer from. The only way to learn the Italian rules is to internalize the patterns: modals optional, stare+gerundio obligatory climbing, gerundi/infinitives/imperatives obligatory attaching, causatives obligatory climbing.

The most frequent learner errors are:

1. Omitting climbing entirely and always attaching (sto leggendolo instead of lo sto leggendo — wrong with progressive).
2. Climbing where it doesn't belong (lo dopo aver letto, ho deciso — wrong; preposition + infinitive forces enclitic).
3. Stranding clitics in the middle of a stack (sto per te lo dire — wrong; should be te lo sto per dire or sto per dirtelo).
4. Forgetting the cluster modification (mi lo dai instead of me lo dai).

Common mistakes

Key takeaways

Clitic placement in complex sentences follows a layered system, and four points capture it:

1. The four landing rules: (a) modals + infinitive — climbing optional; (b) stare

   • gerundio and causatives fare/lasciare — climbing obligatory; (c) bare infinitive, independent gerundio, tu/noi/voi imperative — clitic attaches as enclitic; (d) inflected verb in a finite clause — clitic proclitic. Memorize these four cells and you can parse any Italian sentence.

2. In stacks, head or tail — never middle. Te lo sto per dover dire (head) or sto per dovertelo dire (tail). Stranding a clitic between two infinitives is essentially always wrong.

3. Cluster forms are mandatory. Mi → me, ti → te, gli/le → glie-, ci → ce, vi → ve, si → se before another clitic or ne. Mi lo never; me lo always.

4. Reflexives behave like other clitics, but with auxiliary side-effects. Climbed reflexive in a compound modal triggers essere; attached reflexive in colloquial speech often allows avere. The standard form is the climbed one with essere.

For the modal-specific rules, see Combined Clitics with Modals. For the cluster ordering, see Combined Clitics: Order. For the placement basics in simple sentences, see Clitic Placement Overview. For stacking with multiple periphrases, see Stacked Periphrases. For the modal-perfect interaction, see Modal Perfect Constructions. For the causative pattern, see Causative fare + infinitive.