Portuguese Verb Complement Rules and Examples With Infinitives

Introduction

Understanding how verbs take complements in Portuguese helps learners build accurate, natural sentences. This article explains Portuguese verb complement rules with a focus on using infinitives. You will learn which verbs require direct objects, which use prepositions, when to use the infinitive or personal infinitive, and see clear Brazilian Portuguese examples.

What is a verb complement?

A verb complement completes the meaning of the verb. In Portuguese complements can be direct objects, indirect objects introduced by prepositions, predicative complements, or clauses that function like nouns. Knowing the type of complement a verb requires prevents grammar errors and awkward translations.

Basic terms to know

First appearances of key terms are highlighted. A objeto direto is a complement without a preposition, answering what or whom. A objeto indireto uses a preposition, usually para, a, com, de, or em. The infinitivo pessoal is an infinitive conjugated to agree with its subject. The infinitivo impessoal is the base form of the verb, unchanged by person or number.

When verbs take direct objects (objeto direto)

Many transitive verbs take a noun phrase as a direct object without a preposition. These verbs ask what or whom. Recognizing them is straightforward in simple sentences.

Common transitive verbs

Examples of verbs that typically take a objeto direto include comer, ler, ver, ouvir, and estudar.

Eu comi o bolo.
Ela leu o livro.
Nós vimos o filme.

Notice there is no preposition between the verb and the object. The object directly completes the verb.

When verbs require prepositions (objeto indireto)

Some verbs need a preposition before their complement. These are often verbs expressing direction, intention, opinion, or emotion. The preposition used depends on the verb and sometimes the intended meaning.

Common patterns

Verbs that commonly use a preposition include gostar de, precisar de, falar com, acreditar em, and depender de.

Eu gosto de música.
Ele precisa de ajuda.
Você fala com a professora?

Here the preposition is essential. Removing it changes the sentence or makes it ungrammatical.

Infinitives: impessoal vs pessoal

The infinitive form can appear in two main variants. The infinitivo impessoal is the unconjugated form used when subject identity is not expressed. The infinitivo pessoal agrees with the subject and is used when different subjects act within the same clause or to emphasize who performs the action.

Infinitivo impessoal examples

Infinitive used as a general action, with no explicit subject agreement.

É importante estudar para a prova.
Quero comer agora.

Infinitivo pessoal examples

Use the personal infinitive when the infinitive has a clear subject that differs from the main clause subject. Conjugation endings are -r, -res, -r, -rmos, -rdes, -rem for regular verbs in many cases.

Seria bom nós viajarmos juntos.
Ele pediu para eu ligar depois.

In the first example the infinitive viajarmos agrees with nós. In the second example, ligar appears as a base infinitive because the construction ped​​ir para + infinitive often uses the impersonal form, though colloquial speech may vary.

Verbs followed by infinitives without prepositions

Certain verbs are immediately followed by an infinitive without prepositions. These verbs often express desire, obligation, intention, or perception. Recognizing them helps avoid adding unnecessary prepositions.

Common verbs taking a direct infinitive

Verbs like querer, poder, dever, começar, continuar, and perceber commonly take a direct infinitive.

Eu quero estudar agora.
Ela pode vir amanhã.
Devemos sair já.

Do not add a preposition between the main verb and the infinitive in these constructions. Querer estudar is correct, querer para estudar is incorrect.

Verbs that require para + infinitive

When the purpose of an action is expressed, many verbs or expressions use para plus an infinitive. Para indicates purpose or intention and links the main action to its goal.

Purpose and intention

Use para + infinitive to say in order to or for the purpose of.

Estudo para passar no exame.
Saí cedo para chegar a tempo.
Ela fez a compra para cozinhar hoje.

Some verbs naturally combine with para to express intention. For instance, pedir para, convidar para, and preparar algo para.

Verbs that require de + infinitive

Certain verbs use de before an infinitive. This often happens with verbs that express beginning, finishing, remembering, or avoiding, and with abstract constructions.

Common verbs with de

Examples include acabar de, esquecer de, tentar de (colloquial often tentar + infinitive without de), and ter medo de.

Acabei de comer.
Ele esqueceu de ligar.
Tenho medo de voar.

Note that some verbs shift meaning depending on whether you use the preposition. For example, lembrar de + infinitive means to remember to do something, while lembrar + noun can mean to remind.

Perception verbs: ouvir, ver, sentir

Perception verbs can be followed by an infinitive directly or by a clause introduced by que, depending on what is being perceived.

Direct infinitive with perception verbs

When you perceive an entire action, you can use the infinitive without a preposition.

Vi o carro bater no muro.
Ouvi as crianças brincar no quintal.

These sentences imply witnessing the action. If you want to emphasize the process rather than the full action, a subordinate clause with que or the gerund may be used.

Complement clauses with que and use of infinitives

Many verbs require a subordinating conjunction, usually que, before a full clause complement. In these cases the verb in the subordinate clause must be conjugated, not infinitive, unless the subordinate meaning allows an infinitive for brevity or stylistic reasons.

Verbs followed by que + finite verb

Verbs of saying, thinking, perceiving opinions, or claiming often require que.

Acho que vai chover.
Digo que ela está ocupada.
Ele acredita que conseguirá.

When a noun or pronoun subject of the subordinate clause is the same as the main clause subject, Portuguese sometimes uses an infinitive with a preposition or the personal infinitive instead of que. This is especially common in informal speech or to avoid repetition.

Using the personal infinitive to express subject change

The infinitivo pessoal is particularly useful when the action in the infinitive has a different subject from the main clause, or when there are multiple subjects acting. It avoids the need for a full subordinate clause introduced by que.

Examples with subject agreement

É importante eles chegarem cedo. (personal infinitive: chegarem agrees with eles)
Preciso que tu venhas. or Preciso de tu vires. (two ways depending on verb choice)

Using the personal infinitive can sound more concise and formal in some constructions, but in many spoken contexts speakers prefer the que + finite verb structure.

Negative forms and the infinitive

Negation with infinitives requires attention. Simply placing não before the infinitive negates the action. When using prepositions, the negation still precedes the infinitive phrase.

Examples

Ele não quer trabalhar hoje.
Não precisamos de sair agora.
Ela não deixou ninguém entrar.

With the personal infinitive, the negative particle não goes before the conjugated infinitive form: Não é permitido eles saírem.

Cultural and usage notes

Brazilian Portuguese tends to prefer simpler constructions in spoken language. Many learners hear personal infinitive less often in casual conversations where speakers use que plus a conjugated verb or a different structure. Formal writing and careful speech, however, will use the personal infinitive appropriately, especially to avoid ambiguity or repetition.

Also note regional variation. Some prepositions are more favored in Portugal than in Brazil and vice versa. Focus on examples from Brazilian Portuguese when practicing with native materials like podcasts, novelas, and news to attune your ear to common usage.

Common learner mistakes and how to avoid them

1) Inserting unnecessary prepositions: avoid putting para or de when the verb takes a direct infinitive. Compare Quero estudar with *Quero para estudar which is incorrect.
2) Forgetting to use para for purpose: use para + infinitive to express intent. Estudo para passar no exame is correct.
3) Misusing the personal infinitive: only use it when the infinitive has its own subject or to express simultaneous actions with different subjects. Otherwise prefer impersonal infinitive or que + conjugated verb.
4) Confusing lembrar de and lembrar: lembrar de + infinitive means remember to do something; lembrar alguém de algo means remind someone of something.

Quick reference: which structure to use

Transitive verbs taking a direct object: use objeto direto (no preposition) + noun or pronoun.
Verbs of desire, ability, obligation: use direct infinitive after the main verb (quero + infinitive, posso + infinitive, devo + infinitive).
Purpose: use para + infinitive.
Obligation or recent past: acabar de + infinitive.
Different subjects for the infinitive: use infinitivo pessoal when agreement is needed, otherwise use impersonal infinitive or que + conjugated verb.

Conclusion

Mastering Portuguese verb complements with infinitives requires learning which verbs take direct objects, which need prepositions like para or de, and when to use the infinitivo pessoal versus the impersonal infinitive. Pay attention to common verbs and their patterns, listen to Brazilian Portuguese examples, and gradually integrate these structures into speech. With practice you will build more natural, accurate sentences and understand native speech better.