Personal Infinitive in Portuguese (Infinitivo Pessoal)

The Personal Infinitive (Infinitivo Pessoal) is unique to Portuguese and commonplace. There’s no parallel in other languages and learners of Portuguese often struggle to wrap their heads around it.

We use the Portuguese Personal Infinitive in a few impersonal structures and subordinate clauses, namely concessive, final, and conditional clauses.

Another common and related question concerns the difference between Personal and Impersonal Infinitives (the Impersonal Infinitive is what people usually refer to when they say ‘Infinitive’).

In short, the Portuguese Personal Infinitive is a conjugated version of the Impersonal Infinitive. While the latter only represents the conceptual idea of the verb (dissociated from any tense, mood, or person), the former, through its conjugated verb forms, unveils the person to which the verb is referring.

Put another way, the Personal Infinitive makes it less abstract. Read on.

Lesson #98 Infinitivo Pessoal - Portuguesepedia

Conjugating the Personal Infinitive in Portuguese

It is easy to conjugate the Personal Infinitive. You take the “normal” Infinitive form – the Impersonal Infinitive – and a few conjugational endings, namely to the 2-person singular and all persons in the plural (added endings marked in bold in the tables below).

These endings are always the same regardless of the conjugation group (-ar, -er, -ir), or whether the verbs are regular or irregular.

Let’s look at 3 regular verbs, one for each conjugation group:

	Tomar	Vender	Decidir
Eu	tomar	vender	decidir
Tu	tomares	venderes	decidires
Ele, ela	tomar	vender	decidir
*Nós*	tomarmos	vendermos	decidirmos
*Vocês* *Eles, Elas*	tomarem	venderem	decidirem

Note! For regular verbs, the verb forms of the Personal Infinitive happen to be the same as the Future Subjunctive, but not concerning irregular verbs.

Learn more about the Portuguese Future Subjunctive: Portuguese Future Subjunctive (Futuro do Conjuntivo).

And here are 3 irregular verbs with the exact same conjugation pattern as above:

	Ser	Fazer	Ir
Eu	ser	fazer	ir
Tu	seres	fazeres	ires
Ele, ela	ser	fazer	ir
Nós	sermos	fazermos	irmos
Vocês Eles, Elas	serem	fazerem	irem

When to use the Personal Infinitive in Portuguese

For the most part, the Personal Infinitive in Portuguese is used in complex sentences and is normally placed inside the dependent clause right after a linking word or phrase. Below, I will guide you through several such structures with concrete examples.

A couple of things before we start.

As we go through the examples, you will realize that we use the Personal Infinitive in structures where we often also use the Present Subjunctive*.

In that sense, they are closely related and whether we use one or the other depends on the linking word or phrase. For instance, the Present Subjunctive is strongly associated with the linking word que.

* Learn more about the Present Subjunctive in Portuguese: Present Subjunctive in Portuguese: How and When to Use It.

Impersonal structures

We often use the Personal Infinitive in the following impersonal structure:

é + adjective + personal infinitive

Here are a couple of examples:

É importante (tu) ficares em casa a descansar.
You must stay at home and rest.

É imprudente (nós) irmos à rua com este tempo.
It is not reasonable that we go out in this weather.

É provável (eles) chegarem depois das 15h.
They are likely to arrive after 3 p.m.

Note that we’d use the Present Subjunctive if we added que before the verb:

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