Clitic Climbing: Pronoun Attachment to Multi-Verb Constructions

In Spanish, object pronouns (me, te, lo, la, le, nos, os, los, las, les, se) are clitics — tiny grammatical particles that cannot stand alone. They have to attach to a verb. In simple sentences, this is easy: Lo vi (I saw him). But in sentences with two verbs — a main verb plus an infinitive or gerund — Spanish offers a choice, and that choice has rules.

Clitic climbing is the phenomenon where a pronoun that logically belongs to the lower verb (the infinitive or gerund) "climbs up" and attaches to the higher, conjugated verb instead. This happens all the time in Spanish, and it's one of the markers of natural, fluent speech.

The Basic Alternation

Consider I want to see it. The pronoun lo is the object of ver. Spanish lets you express this in two equally correct ways:

In the first, lo attaches to ver — its own verb. In the second, lo climbs up and sits before quiero — the main conjugated verb. Both mean exactly the same thing, both are standard, and both are used constantly.

The same alternation works for gerunds:

Note the accent mark on diciéndotelo: when you attach pronouns to a gerund, the stress moves and you must write the accent.

When Climbing Is Possible

Clitic climbing is allowed when the main verb is one of a specific set of "restructuring" verbs. These include:

• Modal verbs: poder, deber, tener que, haber de, soler, querer
• Verbs of motion: ir a, venir a, volver a
• Aspectual verbs: empezar a, comenzar a, seguir, continuar, dejar de, acabar de, terminar de, estar
• Causative verbs: hacer, mandar, dejar (with infinitive)

When Climbing Is Not Possible

Not every two-verb construction allows climbing. If the lower clause is not an intimate complement of the main verb, the pronoun has to stay attached to its own verb.

You cannot say Lo decidió comprar. Verbs like decidir, prometer, lamentar, and confesar do not allow climbing — the lower infinitive is too independent.

Here again, climbing (Lo recuerdo haber visto) is not natural. The test is roughly whether the main verb is "light" enough to act as a kind of auxiliary. If it carries real semantic weight of its own, climbing is usually blocked.

Required Attachment: Affirmative Commands

With affirmative commands, pronouns must attach to the end of the verb. Climbing is not an option — there's only one verb, and the pronouns follow it.

Notice the accent marks: adding pronouns to a command can shift the stress, so you need a written accent to preserve the original pronunciation.

With negative commands, the rule flips — pronouns must go before the verb:

Required Attachment: Standalone Infinitives and Gerunds

When an infinitive or gerund is not governed by a conjugated verb — for example, when it's the subject of a sentence or follows a preposition — there's no higher verb to climb to, and the pronoun must attach.

In these cases, there's no option — the pronoun attaches to the infinitive or gerund.

Required Pre-Verbal Placement: Simple Conjugated Verbs

When there's just one conjugated verb (no infinitive or gerund involved), the pronoun must go before it. Attaching to a simple conjugated verb is ungrammatical in modern Spanish.

Saying Vilo ayer or Diéronmelo is archaic — you'll see it in old literature but never in modern speech. The only exception is formal literary style, which occasionally attaches to a sentence-initial conjugated verb: Díjome que sí (He told me yes). Don't imitate this.

Multiple Pronouns Climb Together

When there are two pronouns (indirect + direct), they always travel together. You cannot split them — one can't climb while the other stays behind.

Both versions are correct, but you cannot say Se voy a decirlo or Lo voy a decirse. The cluster se lo moves as a unit.

Also remember that le and les become se when they precede lo, la, los, or las — a rule that applies regardless of where the cluster lands.

Edge Cases and Tricky Constructions

Chains of Three Verbs

With three verbs (conjugated + infinitive + infinitive), the pronoun can climb all the way up, or attach to the final infinitive.

Mixing — attaching to the middle verb (Quiero empezarlo a aprender) — is usually avoided and sounds awkward.

With Periphrastic Future (ir a + infinitive)

The periphrastic future is one of the most common climbing environments. Both versions are heard constantly.

With Progressive (estar + gerund)

Same story with the progressive.

Where to Go Next

Clitic climbing is a finishing-touch feature that separates advanced learners from natives. To keep building your mastery of Spanish object pronouns, study Direct Object Pronouns and Indirect Object Pronouns. For the broader syntactic picture, review Subordinate Clauses Overview.