Conjunctions of Time + Subjunctive | Portuguese (Brazil) Grammar

In English, future time clauses use the present tense: "When I arrive, I'll call you." Brazilian Portuguese does something English has no tool for — it puts the verb of a future time clause into the future subjunctive (futuro do subjuntivo), a tense that exists in almost no other living European language. Saying Quando eu chegar, te ligo is not optional polish; Quando eu chego, te ligo means something different (a habit). This page covers the temporal conjunctions that govern this future subjunctive, plus the one conjunction that breaks the pattern entirely: antes que.

The logic is consistent with the rest of the subjunctive: a future event has not happened yet, so the language refuses to treat it as established fact. The future subjunctive is Portuguese's dedicated grammatical signal for "this point in time is anticipated but not yet real."

The core temporal conjunctions

These conjunctions, when pointing at a future event, take the future subjunctive:

Conjunction	Meaning	Example (future subjunctive)
quando	when	quando eu chegar
enquanto	while / as long as	enquanto estiver chovendo
assim que	as soon as	assim que ele souber
logo que	as soon as	logo que puder
depois que	after	depois que terminarmos
até que	until	até que tudo se resolva
sempre que	whenever	sempre que você precisar

The future subjunctive is formed from the third-person plural of the preterite, minus -ram: chegaram → chegar, souberam → souber, puderam → puder, estiveram → estiver, fizeram → fizer. For regular -ar verbs it happens to look identical to the infinitive (chegar, falar), which lulls learners into thinking nothing special is going on — until they hit an irregular verb like vir (vier, not vir) or ter (tiver, not ter).

Quando eu chegar em casa, te mando uma mensagem.

When I get home, I'll text you. (future subjunctive: chegar)

Assim que ele souber o resultado, ele avisa todo mundo.

As soon as he finds out the result, he'll let everyone know. (souber, from souberam)

Vou esperar aqui até que você volte.

I'll wait here until you come back. (volte)

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To build the future subjunctive, take the eles preterite form and drop -am: fizeram → fizer, tiveram → tiver, vieram → vier, forem (ser/ir). The trap is that regular -ar verbs look just like the infinitive, so learners never notice the rule until an irregular verb exposes it.

enquanto — "as long as" looking forward

Enquanto with a future reference takes the future subjunctive. With a present, ongoing situation it takes the indicative — the same habitual-vs-future split you see with quando.

Enquanto estiver chovendo, fico em casa.

As long as it's raining, I'll stay home. (future projection — estiver)

Enquanto ele estuda, eu preparo o jantar.

While he studies, I make dinner. (simultaneous present habit — indicative: estuda)

The contrast is real: estiver projects forward to an as-yet-unrealized stretch of rain, while estuda describes what regularly happens in parallel right now.

depois que and logo que

Both keep the future subjunctive when the event is still ahead. Note the contracted, very natural Brazilian phrasings below — these are sentences people genuinely say.

Depois que a gente terminar a reunião, vamos almoçar juntos.

After we finish the meeting, we'll have lunch together. (terminar)

Logo que eu puder, eu te ajudo com a mudança.

As soon as I can, I'll help you with the move. (puder, from puderam)

A frequent slip here is writing the infinitive poder instead of the future subjunctive puder. They differ by a single vowel, and the difference is grammatically load-bearing.

The outlier: antes que always takes the subjunctive

Here is the conjunction that refuses to follow the future-vs-habitual logic. Antes que (before) takes the subjunctive in every tense — present subjunctive for present/future, and imperfect subjunctive even for habitual or past situations. It never takes the indicative, ever.

Vou avisar você antes que seja tarde demais.

I'll warn you before it's too late. (present subjunctive: seja)

Saímos de casa antes que começasse a chover.

We left the house before it started to rain. (past — imperfect subjunctive: começasse)

Notice what does not happen: there is no future subjunctive form começar here, and no indicative começou. Even though the rain is a real, completed past fact, antes que forces começasse. Why? Because "before X happens" frames X as not-yet-real relative to the main event — at the moment we left, the rain had not yet begun. The event is anterior-and-still-pending from the vantage point of the clause it modifies, so Portuguese treats it as inherently non-factual.

Antes que eu falasse qualquer coisa, ela já tinha respondido.

Before I could say anything, she had already answered. (imperfect subjunctive: falasse)

Quero te explicar tudo antes que você tome uma decisão.

I want to explain everything to you before you make a decision. (tome)

Contrast this with antes de + infinitive, which most Brazilians use far more often in speech for same-subject sentences and which sidesteps the subjunctive entirely: Saímos antes de começar a chover / Antes de tomar uma decisão, pense bem. Use antes que when the two clauses have different subjects or when you want the more formal, explicit construction.

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Memorize antes que as the conjunctional outlier: it takes the subjunctive in every tense, including the imperfect subjunctive for past events (antes que começasse), where you might expect a past indicative. If the subjects are the same, antes de + infinitive is the lighter, more colloquial choice.

Two readings, two moods

It bears repeating because it is the single most common source of error. Several of these conjunctions — quando, enquanto, sempre que, depois que — point at two different kinds of situation:

Reading	Mood	Example
Habitual / general truth	Present indicative	Sempre que ele vem, traz um presente.
Single future event	Future subjunctive	Sempre que ele vier, vai trazer um presente.

Sempre que você precisar, é só me chamar.

Whenever you need (anything in future), just call me. (precisar)

Sempre que ele chega atrasado, a aula já começou.

Every time he arrives late, class has already started. (habitual — indicative: chega)

Common Mistakes

These are the precise transfer errors English speakers make, because English uses the present tense in all these slots:

❌ Quando eu chego em casa amanhã, te ligo.

Incorrect — a single future event needs the future subjunctive 'chegar'

✅ Quando eu chegar em casa amanhã, te ligo.

When I get home tomorrow, I'll call you.

❌ Assim que ele sabe, ele me avisa.

Incorrect — for a future event use 'souber', not the present indicative

✅ Assim que ele souber, ele me avisa.

As soon as he finds out, he'll let me know.

❌ Logo que eu poder, eu te ajudo.

Incorrect — the future subjunctive of poder is 'puder', not the infinitive

✅ Logo que eu puder, eu te ajudo.

As soon as I can, I'll help you.

❌ Saímos antes que começou a chover.

Incorrect — 'antes que' takes the subjunctive, even for a past event: 'começasse'

✅ Saímos antes que começasse a chover.

We left before it started to rain.

❌ Vou esperar até que você vem.

Incorrect — the future subjunctive of vir is 'vier', not 'vem'

✅ Vou esperar até que você venha.

I'll wait until you come. (até que can also take the present subjunctive 'venha' for an open-ended wait)

Key Takeaways

Future time clauses take the future subjunctive, where English uses the present: quando eu chegar = "when I arrive."
Build it from the eles preterite minus -am: fizer, tiver, vier, puder, for.
quando, enquanto, assim que, logo que, depois que, sempre que split between indicative (habitual) and future subjunctive (single future event).
antes que is the outlier: always subjunctive, in every tense, including the imperfect subjunctive for past events (antes que começasse).
For same-subject sentences, antes de
- infinitive is the more colloquial alternative to antes que.

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