futuro do conjuntivo - portuguese future subjunctive

Future Subjunctive

As previously mentioned, the futuro do conjuntivo Play normal audio future subjunctive allows us to talk about the conditions that must be met in order for a potential future action to occur, (i.e. “If this goes well, I will do that” or “When we get home, I will do that”). This tense appears in subordinate adverbial clauses (i.e. clauses which function like an adverb), as well as in relative clauses. It often goes along with the conjunction se paused audio playing audio Play slow audio Play normal audio if or others such as:

  • assim que paused audio playing audio Play slow audio Play normal audio as soon as, once
  • sempre que paused audio playing audio Play slow audio Play normal audio whenever
  • quando paused audio playing audio Play slow audio Play normal audio when
  • enquanto paused audio playing audio Play slow audio Play normal audio while, as long as
  • como paused audio playing audio Play slow audio Play normal audio how
  • o que Play normal audio what

Verb Conjugation

Regular Verbs
With regular verbs, the futuro do conjuntivo is conjugated exactly the same as the infinitivo pessoal (personal infinitive). All you need to do is add the correct terminations to the infinitive, without removing any letters. Both the 1st and 3rd person singular stay exactly the same as the infinitive itself, making the endings as follows: (none), –es, (none), –mos, –em.
Here’s an example of how to conjugate the regular verbs comer paused audio playing audio Play slow audio Play normal audio to eat and falar paused audio playing audio Play slow audio Play normal audio to speak:

se eu comer falar
se tu comeres falares
se ele / ela / você comer falar
se nós comermos falarmos
se eles / elas / vocês comerem falarem

Irregular verbs
Regarding irregular verbs, you might find the following shortcut useful: Conjugate the verb in the 3rd person plural of the pretérito perfeito (simple past tense), remove the -am ending, then add the same endings shown above, according to each subject: (none), -es, (none), -mos, -em.
Let’s try it out with the irregular verb ser:

  1. Conjugate the verb in the 3rd person plural simple past tense: foram
  2. Drop the -am ending: for-
  3. Now, make it hypothetical! To put it in the futuro do conjuntivo, add the conjunction (such as se) and add the correct ending depending on who we’re talking about:

se eu for Play normal audio if I go
se tu fores Play normal audio if you go
se ela for Play normal audio if she goes
se nós formos Play normal audio if we go
se eles forem Play normal audio if they go

More Examples

Se levares o carro, tens de pôr gasolina Play normal audio If you take the car, you have to put gas in it
Assim que chegarem, avisem Play normal audio As soon as you (pl.) arrive, let me know
Enquanto for estudante, tenho desconto Play normal audio As long as I'm a student, I get a discount
Faz como quiseres Play normal audio Do it however you want
Quando tiver fome, faço o almoço Play normal audio Once I'm hungry, I'll make lunch

Futuro do Conjuntivo vs. Imperfeito do Conjuntivo

You will probably come across a lot of “if” statements in both the imperfeito do conjuntivo and the futuro do conjuntivo, since both can be used to talk about potential future actions. So how do you know when to use which tense?
The difference is that the imperfeito version typically goes along with “if” when talking about a completely hypothetical situation, i.e. something that is unrealistic or unlikely to take place / to have taken place. The futuro version, on the other hand, is usually used along with “if” to talk about a likely or inevitable outcome.
Se eu for passear, vais comigo? Play normal audio If I go for a walk, will you go with me? (futuro do conjuntivo)
Se eu fosse passear, ias comigo? Play normal audio If I went for a walk, would you go with me? (imperfeito do conjuntivo)
While they’re both hypothetical, in the first example, the subject is seriously thinking about going for a walk in the near future. In the second example, the speaker may want to know how the listener feels about walks in general, his company, and/or if they’d join him on a walk some (unspecified) day.

Futuro do Conjuntivo vs. Infinitivo Pessoal

Many (but not all!) irregular verbs are going to have a different conjugation in the infinitivo pessoal (personal infinitive) and the futuro do conjuntivo. However, as we said earlier, regular verbs share the same conjugation in both tenses. So how can you tell the difference between the two? As usual, context is key! Remember that the futuro do conjuntivo is generally used to talk about the conditions that need to be met for a likely outcome to occur.

Conjunction + Futuro do Conjuntivo

As such, the conjunctions used in the sentence can sometimes give you a clue. The futuro do conjuntivo must be preceded by a conjunction, whereas the infinitivo pessoal does not (necessarily) have to. For example:

  • Infinitivo pessoal: É melhor vocês porem a mesa Play normal audio It's better you (pl.) set the table, You (pl.) had better set the table

To say something similar in the futuro do conjuntivo, we could use the conjunction se paused audio playing audio Play slow audio Play normal audio if, which results in a slightly different meaning:

  • Futuro do conjuntivo: É melhor se forem vocês a pôr a mesa Play normal audio It's better if you were the ones to set the table

In the first example, the focus is on you (pl.) doing the action, i.e. commenting that this is something you should do. In the second example, it’s about commenting on the hypothetical possibility of you (pl.) being the ones to do the action, as opposed to someone else doing it. Thus, you can see how they are similar, but the second makes the meaning more conditional.

Para + Infinitivo Pessoal

While we’re on the subject, let’s talk about when the personal infinitive can be preceded by a conjunction. While the future subjunctive appears in adverbial and relative clauses, the personal infinitive appears in substantive ones, preceded by the conjunction para and with verbs that indicate an order. Let’s try it with the regular verb começar:

  • Infinitivo pessoal: Ele disse para começares a comer Play normal audio He told you to start eating, He said for you to start eating

To use the same verb in the future subjunctive, the conjugation is the same. However, notice that we needed to make a few changes, and even added another clause to the sentence. This way we are discussing a potential outcome based on the condition that “you start eating”:

  • Futuro do conjuntivo: Ele disse que, se começares a comer, fala contigo Play normal audio He said that if you start eating, he'll talk to you.


  • Quite tough but these constructions are so important and of use everyday that I will soldier on to master them…….well, “master” is a bit of an overstatement.

  • Bom dia,
    Foi muito instrutivo, obrigada.
    Nunca ouvi falar de isto – e entretanto deparas-te com essas formas muitas vezes!

  • Acabo de estudar o futuro do conjuntivo com a minha professora. É bem difícil mas esta lição ajudou- me perceber. Obrigada por uma explicação tão claro!

  • The explanation regarding the personal infinitive versus the future conjunctive is really terrific. You took a subtle and difficult distinction and made it clear.

  • Thank you!

    This explanation helped so much because I was struggling to identify the difference between Futuro do Conjuntivo and Infinitivo Pessoal!

    I also didn’t realise that conjuntivo is subjuntivo, so thank you for clarifying this!

  • Why in “Assim que chegarem, avisem .” conjuntivo presente for avisem ? The other examples all have the indicative.

    • The present subjunctive is used as an imperative of sorts for grammatical persons that don’t have true imperative forms (which only exist for the second-person singular and plural with tu and vós).

      Vocês is now the most used form of the plural you, but grammatically, it’s actually conjugated as a third-person plural. This means it doesn’t have an imperative form. So, in this imperative sentence with vocês, the present subjunctive has to stand in.

      Note that there’s another example here that uses the imperative – but the real one, in that case: “Faz como quiseres” (second-person singular with tu)

      The Imperative

  • In this phrase
    Ele disse para começares a comer
    why in this case are you not using an indirect pronoun for dizer to clarify the recipient of the instuction ie you (pl) or them in other words how is this understood in the construction?

    • Olá! You can still add an object pronoun if you’d like, but in this case, it’s also absolutely fine to omit it because the second verb form already clarifies who we are referring to –> “começares” is a second-person singular conjugation, so from that we know he’s talking to “you” (singular) 🙂

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