When an Italian sentence has a modal verb plus an infinitive (voglio dire, devo chiamare, posso aiutare) and the embedded infinitive carries a combined clitic, the combined clitic has two options. It can climb to the modal — te lo voglio dire, me la deve chiamare, glielo posso aiutare — or it can stay attached to the infinitive as one word — voglio dirtelo, deve chiamarmela, posso aiutarglielo. Both placements are equally grammatical; the meaning is identical; the choice is stylistic.
This is one of the most distinctive features of Italian syntax, and combined clitics are where the choice gets visually striking — te lo voglio dire and voglio dirtelo look like very different sentences but are interchangeable. Mastering the climbing pattern is also one of the clearest markers of educated, fluent Italian. This page covers all the climbing environments, the rule that combined clitics must move as a unit, and the one place where climbing is obligatory: causative fare and permissive lasciare.
The basic alternation: modal + infinitive
The four core modal verbs in Italian are volere (to want), potere (to be able to), dovere (to have to), and sapere (to know how to). When any of them takes an infinitive that has a combined clitic, two placements are available:
| Climbed (clitic on modal) | Attached (clitic on infinitive) | Meaning |
|---|---|---|
| Te lo voglio dire. | Voglio dirtelo. | I want to tell you. |
| Me la deve presentare. | Deve presentarmela. | He has to introduce her to me. |
| Glielo posso spiegare. | Posso spiegarglielo. | I can explain it to him / her. |
| Ce ne sa parlare bene. | Sa parlarcene bene. | He knows how to talk to us about it well. |
| Ve li voglio mostrare. | Voglio mostrarveli. | I want to show them to you all. |
| Se lo deve mettere. | Deve mettersela. | He has to put it on / her on. |
Te lo voglio dire una volta per tutte: smettila.
I want to tell you this once and for all: stop it.
Voglio dirtelo una volta per tutte: smettila.
Same meaning — clitic attached to the infinitive instead.
Glielo devo spiegare con calma, sennò non capisce.
I have to explain it to him / her calmly, otherwise he/she won't understand.
Devo spiegarglielo con calma, sennò non capisce.
Same meaning — equivalent placement.
Me lo puoi prestare un attimo? Me ne servo solo cinque minuti.
Can you lend it to me for a moment? I only need it for five minutes.
Puoi prestarmelo un attimo? Me ne servo solo cinque minuti.
Same meaning — climbed vs attached, fully interchangeable.
In modern spoken Italian, climbing is slightly more common in spontaneous speech, while attachment is slightly more common in writing — but the tendencies are weak, and you will hear and read both freely. Native speakers often alternate within a single conversation, choosing whichever feels rhythmically better in the moment.
The rule: combined clitics move AS A UNIT
The single most important syntactic constraint with combined clitics and modals is that the two clitics must travel together. You cannot leave one of them behind on the infinitive while the other climbs to the modal, and you cannot split them across different positions in the sentence.
| Wrong | Right | Why |
|---|---|---|
| Te voglio dirlo. | Te lo voglio dire. / Voglio dirtelo. | te and lo cannot be split |
| Me deve presentarla. | Me la deve presentare. / Deve presentarmela. | me and la cannot be split |
| Gli posso spiegarlo. | Glielo posso spiegare. / Posso spiegarglielo. | gli and lo must merge to glielo and stay together |
| Ce voglio parlarne. | Ce ne voglio parlare. / Voglio parlarcene. | ce and ne cannot be split |
The phonological reasoning is that a combined clitic forms a single prosodic unit — te lo, ce ne, glielo — which Italian treats as one chunk for syntactic purposes. Splitting it would break that prosodic unit and produce a string that is impossible to pronounce naturally.
❌ Te voglio dire lo.
Incorrect — splits the combined clitic across two positions.
✅ Te lo voglio dire.
Correct — both clitics climb together.
✅ Voglio dirtelo.
Correct — both clitics attach together.
Stare + gerundio (progressive)
The Italian progressive — stare + gerundio — patterns identically to modal + infinitive. The combined clitic can climb to stare or attach to the gerundio:
| Climbed | Attached | Meaning |
|---|---|---|
| Me lo sta dicendo. | Sta dicendomelo. | He's telling me right now. |
| Glielo sto spiegando. | Sto spiegandoglielo. | I'm explaining it to him / her. |
| Te la stiamo cercando. | Stiamo cercandotela. | We're looking for it (f.) for you. |
| Ce ne sta parlando ora. | Sta parlandocene ora. | He's talking to us about it now. |
In modern speech, climbing dominates with stare + gerundio: me lo sta dicendo sounds noticeably more natural than sta dicendomelo in conversation. Both are fully grammatical; native speakers simply tend to climb here. In writing, both appear, with attachment slightly more visible in formal prose.
Te lo sto dicendo da un'ora, dovresti ascoltare.
I've been telling you for an hour, you should listen.
Glielo sto spiegando proprio adesso, abbi pazienza.
I'm explaining it to him / her right now, be patient.
Ce ne stanno parlando da settimane senza decidere niente.
They've been talking to us about it for weeks without deciding anything.
Andare / venire + a + infinitive (motion + purpose)
When andare or venire combines with a + infinitive to express motion with a purpose ("to go to do something" / "to come to do something"), the combined clitic again has both options — climb to the motion verb or attach to the infinitive:
| Climbed | Attached | Meaning |
|---|---|---|
| Te lo vado a dire. | Vado a dirtelo. | I'm going to (go and) tell you. |
| Me la viene a portare. | Viene a portarmela. | He's coming to bring it (f.) to me. |
| Glielo andiamo a spiegare. | Andiamo a spiegarglielo. | We're going to explain it to him / her. |
Te lo vado a prendere io, aspettami qui.
I'll go get it for you, wait here.
Vado a prendertelo io, aspettami qui.
Same meaning — attached version.
Me la vieni a trovare quando puoi?
Will you come visit her with me when you can?
Glielo andiamo a chiedere insieme.
Let's go ask him / her together.
The climbed pattern is somewhat more common with this construction in everyday speech, especially when the motion verb is short.
Causative fare + infinitive: climbing is OBLIGATORY
This is the one place in the system where the optionality breaks. When fare combines with an infinitive in a causative construction — "to have something done," "to make someone do something" — the combined clitic of the embedded infinitive must climb to fare. Attaching it to the embedded infinitive is ungrammatical.
| Wrong (attached) | Right (climbed) | Meaning |
|---|---|---|
| Fa farmelo. | Me lo fa fare. | He makes me do it. |
| Faccio dirtelo. | Te lo faccio dire. | I'm having it told to you. |
| Facciamo sapergliela. | Gliela facciamo sapere. | We let him / her know it (f.). |
| Ho fatto vedermelo. | Me l'ho fatto vedere. | I had him / her show it to me. |
Me lo fa fare ogni domenica, è un incubo.
He makes me do it every Sunday, it's a nightmare.
Glielo facciamo sapere domani, dopo la riunione.
We'll let him / her know about it tomorrow, after the meeting.
Te la faccio chiamare da Marco, è meglio.
I'll have Marco call her — it's better that way. (te = to you, la = her — Marco is the agent.)
Me l'ha fatta riparare il mio meccanico di fiducia.
My trusted mechanic had it (f.) repaired for me.
The grammatical reason is that in a causative construction, fare and the embedded infinitive form a single complex predicate — they are not two separate verbs but one fused unit at the syntactic level. The combined clitic of the embedded infinitive doesn't really belong to that infinitive in the deep structure; it belongs to the whole causative complex, and Italian places it in front of fare obligatorily.
This is why the causative fare construction is the paradigm case where Italian linguistics speaks of clitic climbing as obligatory: there is genuinely no choice. Faccio dirtelo is not just stylistically odd — it is ungrammatical, or it has a completely different reading (where faccio is a separate matrix verb meaning "I do/make" in some non-causative sense).
For the full pattern of the causative construction — including the dative-of-causation that appears with transitive embedded verbs (Faccio leggere il libro a Marco / Glielo faccio leggere) — see the causative fare/lasciare page.
Permissive lasciare: climbing also obligatory
The verb lasciare ("to let," "to allow") in its permissive use behaves identically to causative fare. The combined clitic of the embedded infinitive must climb to lasciare; attaching to the infinitive is wrong.
| Wrong (attached) | Right (climbed) | Meaning |
|---|---|---|
| Lascia farmelo. | Me lo lascia fare. | He lets me do it. |
| Ho lasciato darglielo. | Glielo ho lasciato dare. | I let him / her be given it. |
| Lasciamo dirtela. | Te la lasciamo dire. | We let it (f.) be told to you. |
Me lo lascia fare quando ho tempo, è gentile.
He lets me do it when I have time, he's kind.
Glielo lascia decidere, non vuole imporsi.
He lets him / her decide it, he doesn't want to impose.
Te la lasciano dire perché si fidano di te.
They're letting you say it (f.) because they trust you.
The reasoning is the same as for fare: lasciare + infinitive is a complex predicate, and the combined clitic belongs to the whole construction. Climb obligatorily.
Why climbing matters: a fluency marker
Many grammar books note that climbing is "optional" with modal verbs and treat it as a stylistic quirk. In practice, climbing is one of the clearest dividing lines between fluent and intermediate Italian:
- Beginners default to attachment (voglio dirtelo) because it mirrors the English pattern more transparently — the embedded clause stays intact with its arguments. They produce grammatical Italian, but it has a slight "textbook" flavour.
- Intermediate learners discover climbing (te lo voglio dire) and start using it, often inconsistently, sometimes hyper-correctly.
- Fluent speakers climb fluidly, picking the rhythm that fits the sentence — climbing for short, punchy modal phrases (te lo dico io, me lo deve dire), attaching for longer or more emphatic constructions (voglio dirtelo io di persona).
- Native speakers climb obligatorily with causative fare/lasciare without thinking. Failure to climb here is a clear ungrammatical signal, and even careful learners sometimes slip.
If you can produce te lo voglio dire and voglio dirtelo equally easily, and you climb automatically with causative fare, your Italian sounds native in this dimension. If you always attach, you sound careful but slightly bookish.
Sapere + infinitive: same as the others
The modal sapere ("to know how to") patterns like volere, potere, and dovere — combined clitics climb optionally:
Me lo sa spiegare in due minuti, è bravissimo.
He can explain it to me in two minutes, he's brilliant.
Sa spiegarmelo in due minuti, è bravissimo.
Same meaning — attached version.
Glielo sappiamo dire in inglese, ma non in italiano.
We know how to say it to him / her in English, but not in Italian.
Compound tenses: climbing is still optional, agreement still applies
When the modal verb itself is in a compound tense (passato prossimo: ho voluto, ho dovuto, ho potuto), climbing remains optional, but past-participle agreement with the direct part of the combined clitic enters the picture. As always, the participle agrees only when the clitic precedes the auxiliary.
| Climbed | Attached | Meaning |
|---|---|---|
| Te l'ho voluto dire. | Ho voluto dirtelo. | I wanted to tell you. |
| Te l'ho voluta dire (la verità). | Ho voluto dirtela (la verità). | I wanted to tell you (the truth). |
| Glieli ho dovuti dare tutti. | Ho dovuto darglieli tutti. | I had to give him / her all of them. |
| Gliele ho potute restituire. | Ho potuto restituirgliele. | I was able to return them (f. pl.) to him / her. |
When the clitic climbs, the participle of the modal (voluto, dovuto, potuto, saputo) agrees with the direct part of the combined clitic — voluta, dovuti, potute. When the clitic stays attached to the infinitive, the modal's participle stays masculine singular: ho voluto dirtela (no agreement on voluto), ho dovuto darglieli (no agreement on dovuto).
This is one of the more sophisticated agreement patterns in Italian, and getting it right is a clear marker of careful usage.
Te l'ho voluta dire io di persona, era importante.
I wanted to tell it to you myself in person, it was important. (voluta agrees with the elided la in te l'.)
Glieli ho dovuti restituire prima di andarmene.
I had to give them (m. pl.) back to him / her before leaving.
Common mistakes
❌ Te voglio dirlo.
Incorrect — combined clitics cannot be split. You can't climb te while leaving lo on the infinitive.
✅ Te lo voglio dire. / Voglio dirtelo.
Correct — both clitics climb together, or both attach together.
❌ Lo me deve dire.
Incorrect — the order is always indirect-direct, and the climbing applies as a unit. Also: mi shifts to me before lo.
✅ Me lo deve dire.
Correct — me lo as a unit, climbed to dovere.
❌ Fa farmelo ogni giorno.
Incorrect — with causative fare, the combined clitic must climb to fare. Attaching to the infinitive is ungrammatical.
✅ Me lo fa fare ogni giorno.
Correct — combined clitic obligatorily climbs to fa.
❌ Lascia darglielo a Marco.
Incorrect — with permissive lasciare, the combined clitic must also climb.
✅ Glielo lascia dare a Marco.
Correct — combined clitic climbs to lascia.
❌ Te lo voglio dirlo.
Incorrect — you cannot have the combined clitic in BOTH positions at once.
✅ Te lo voglio dire. / Voglio dirtelo.
Correct — pick one position, never both.
❌ Ho voluto dirtela e te l'ho voluto dire.
Inconsistent agreement — when te l' precedes the auxiliary and refers to la verità, voluto must agree as voluta.
✅ Ho voluto dirtela e te l'ho voluta dire.
Correct — when the clitic climbs, the modal's participle agrees with la.
❌ Glielo sto a dire.
Incorrect — the progressive uses stare + gerundio (dicendo), not stare a + infinitive in this construction.
✅ Glielo sto dicendo. / Sto dicendoglielo.
Correct — stare + gerundio, with optional climbing.
Key takeaways
With modal + infinitive (volere, potere, dovere, sapere), combined clitics can climb to the modal or attach to the infinitive: Te lo voglio dire / Voglio dirtelo. Both are equally correct; the choice is stylistic.
Combined clitics MUST move as a unit. You cannot split them across positions: te voglio dirlo is ungrammatical. Climb both, or attach both.
Stare + gerundio behaves the same: Me lo sta dicendo / Sta dicendomelo. In modern speech, climbing dominates with this construction.
Andare/venire + a + infinitive (motion + purpose) also allows climbing: Te lo vado a dire / Vado a dirtelo.
Causative fare + infinitive REQUIRES climbing: Me lo fa fare is the only correct order. Fa farmelo is ungrammatical or has a different reading.
Permissive lasciare + infinitive REQUIRES climbing: Me lo lascia fare, not Lascia farmelo.
In compound tenses, the modal's past participle agrees with the direct part of the combined clitic when the clitic climbs: Te l'ho voluta dire (la verità). When the clitic attaches, the modal's participle stays masculine singular: Ho voluto dirtela.
Fluent climbing is a competence marker. Beginners default to attachment; intermediate learners discover climbing; fluent speakers alternate freely and climb obligatorily with causative fare and permissive lasciare.
Climbing with combined clitics is the most syntactically sophisticated piece of the clitic system. Once you can produce te lo voglio dire and me lo fa fare without hesitation, the rest of the clitic apparatus is largely behind you. For the imperative-specific patterns of combined clitics, see combined clitics with imperatives. For the broader logic of when clitic climbing is allowed across the verbal system, see modal clitic climbing.
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Open the Italian course →Related Topics
- Combined Clitics: OverviewA2 — When indirect and direct object pronouns appear together — me lo, te la, glielo, ce ne — the form changes and the order is fixed. The merging rules, the full table, and the orthographic glielo trap.
- Me lo, Te lo, Ce lo, Ve lo: The Vowel-Change PatternA2 — When mi, ti, ci, vi, or si meets a direct-object clitic, the final -i shifts to -e — me lo, te la, ce ne, ve li, se le. The full table, the orthography, and why it's two words and not one.
- Glielo: The Fused 3rd-Person Combined CliticA2 — How gli + lo, gli + la, le + lo, and gli + ne all collapse into a single written word — glielo, gliela, glieli, gliele, gliene — and how one form ambiguously covers 'to him', 'to her', and 'to them'.
- Combined Clitics with ImperativesA2 — How combined clitics attach to tu/noi/voi imperatives — dammelo, fammelo, dimmelo — including the consonant-doubling rule and the gli- exception that gives daglielo, faglielo, diglielo.
- Clitic Climbing with Modal VerbsB1 — When dovere, potere, volere, and sapere take an infinitive with a clitic pronoun, the clitic can either attach to the infinitive or 'climb' onto the modal — both are correct, and choosing well is half of sounding native.
- Modal Verbs: Overview (dovere, potere, volere, sapere)A2 — The four verbs that express obligation, possibility, desire, and acquired ability — and the rules they all share for following infinitives, choosing auxiliaries, and behaving like normal verbs in everything except their meaning.
- Direct Object Clitic PlacementA1 — The eight rules that govern where Italian direct-object clitics sit — proclitic before a conjugated verb, enclitic on infinitives, gerunds, and imperatives, with climbing on modals and consonant-doubling on short imperatives.