Purpose (or "final") conjunctions express a goal — the reason something is done in order to bring about. They answer "what for?" In Portuguese the central rule is twofold: when the two clauses have different subjects, you use para que + subjunctive; when they share the same subject, you drop the conjunction and use para + a bare infinitive. Choosing the right structure is mostly about who is doing what.
Why purpose takes the subjunctive
A purpose has not happened yet — it is the intended outcome, a goal projected into the future and not (yet) real. That is the textbook habitat of the subjunctive: the mood of the non-asserted, the wished-for, the not-yet-true. This is exactly why purpose contrasts with cause: a cause is real and asserted (porque + indicative), while a purpose is a goal you are reaching toward (para que + subjunctive). English hides this difference because "so" and "so that" cover both.
para que / a fim de que — different subjects + subjunctive
Para que is the everyday purpose conjunction; a fim de que is its slightly more (formal) twin. Both require the subjunctive and are used when the subject of the purpose clause is different from the subject of the main clause.
Falo devagar para que todos me entendam.
I speak slowly so that everyone understands me.
Deixei um bilhete para que ela soubesse onde eu estava.
I left a note so that she would know where I was. (past — imperfect subjunctive)
A empresa baixou os preços a fim de que mais clientes comprassem.
The company lowered prices so that more customers would buy. (formal)
Notice the subject change in each: I speak / everyone understands; I left / she would know. Because there are two different actors, a full clause with a conjugated subjunctive verb is required. The tense follows the timeframe — present subjunctive (entendam) for present/future, imperfect subjunctive (soubesse, comprassem) for the past.
para + infinitive — same subject, no que
When the same person performs both actions, Portuguese does not use para que + subjunctive. It uses the much simpler para + infinitive. Saying "para que eu passe" when I am both the studier and the passer sounds redundant and unnatural to a native ear.
Estudo muito para passar na prova.
I study a lot (in order) to pass the exam.
Ela acordou cedo para pegar o primeiro voo.
She woke up early to catch the first flight.
A gente economizou o ano inteiro para viajar nas férias.
We saved all year (in order) to travel on vacation.
In each, one subject does both actions: I study and I pass; she woke and she catches. This same-subject rule is the most important practical decision on the page.
When the subjects differ but you still want an infinitive structure, Portuguese can use the personal (inflected) infinitive with para, which is very common and idiomatic — a feature English lacks entirely:
Comprei mais cadeiras para os convidados sentarem.
I bought more chairs for the guests to sit on. (personal infinitive — para + sentarem)
So with different subjects you have two idiomatic options: para que + subjunctive (para que os convidados sentem) or para + personal infinitive (para os convidados sentarem). Both are correct and common.
a fim de + infinitive — same subject, formal
Just as para que has the same-subject form para + infinitive, a fim de que has the same-subject form a fim de + infinitive. It is (formal) and frequent in writing.
Reduzimos os custos a fim de manter os preços estáveis.
We cut costs in order to keep prices stable. (formal)
Do not confuse a fim de ("in order to," purpose) with the colloquial expression a fim de meaning "in the mood for / interested in": Tô a fim de sair ("I feel like going out"). Same spelling, very different use, and context disambiguates.
de modo que / de maneira que — purpose vs result, by mood
These two phrases ("so that / in such a way that") are genuinely two-faced, and the mood decides the meaning:
- subjunctive = purpose
- indicative = result
Organizei tudo de modo que ninguém se perdesse.
I organized everything so that no one would get lost. (purpose — subjunctive)
Organizei tudo com calma, de modo que ninguém se perdeu.
I organized everything calmly, so that (as a result) no one got lost. (result — indicative)
The first sentence states my intention; the second reports what actually happened. That single choice — se perdesse vs se perdeu — flips the clause from purpose to consequence. This is the cleanest demonstration in the language that mood carries meaning, not just grammar.
Fale mais alto, de modo que todos possam ouvir.
Speak louder, so that everyone can hear. (purpose — subjunctive)
Ele falou alto, de maneira que todos ouviram.
He spoke loudly, so that everyone heard. (result — indicative)
For pure result clauses, see also tão... que and tanto... que structures, which always take the indicative because they report what actually happened.
que alone as a reduced "para que"
In colloquial and literary Brazilian Portuguese, a bare que can stand in for para que after certain verbs (especially imperatives), still taking the subjunctive.
Chega mais perto, que eu te conte um segredo.
Come closer, so I can tell you a secret. (colloquial — subjunctive)
Common Mistakes
❌ Estudo muito para que eu passe na prova.
Incorrect (unnatural) — same subject, so use 'para' + infinitive.
✅ Estudo muito para passar na prova.
I study a lot to pass the exam.
❌ Explico devagar para que vocês entendem.
Incorrect — 'para que' requires the subjunctive (entendam), not the indicative.
✅ Explico devagar para que vocês entendam.
I explain slowly so that you understand.
❌ Deixei um bilhete para que ela sabia onde eu estava.
Incorrect — past purpose needs the imperfect subjunctive (soubesse).
✅ Deixei um bilhete para que ela soubesse onde eu estava.
I left a note so that she would know where I was.
❌ Estudei muito porque eu passasse na prova.
Incorrect — this is purpose, not cause; use 'para que' + subjunctive (or 'para' + infinitive).
✅ Estudei muito para passar na prova.
I studied a lot to pass the exam.
Key Takeaways
Para que/a fim de queexpress purpose with the subjunctive and are used when the subjects differ.- When the subject is the same, drop the conjunction:
para- infinitive (
estudo para passar).
- infinitive (
- For different subjects you may also use
para- personal infinitive (
para os convidados sentarem) — a structure English has no equivalent for.
- personal infinitive (
De modo que/de maneira quemean purpose with the subjunctive but result with the indicative; the mood is the meaning.- Don't borrow causal
porquefor a purpose — purpose is a not-yet-real goal and takes the subjunctive, while cause is asserted as real.
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Start learning Portuguese→Related Topics
- Result Conjunctions (Tão...Que, De Modo Que)B1 — How Brazilian Portuguese expresses consequence with tão/tanto...que, de modo/maneira/forma que, tal...que and a ponto de — and why result clauses take the indicative while purpose clauses take the subjunctive.
- Conjunctions and Mood SelectionB1 — The master table mapping each Brazilian Portuguese conjunction to the mood it governs — indicative, subjunctive, or future subjunctive — and the assertion principle that predicts them all.
- Subjunctive with Triggering ConjunctionsB1 — Conjunctions like para que, antes que, embora, and caso that always force the subjunctive in Brazilian Portuguese.
- Causal Conjunctions (Porque, Já Que)A2 — How porque, pois, como, já que and visto que introduce a cause — all with the indicative, because a cause is asserted as real.
- The Subjunctive in BR Portuguese: OverviewA2 — What the subjunctive is, why Brazilian Portuguese keeps all three of its tenses fully alive, and what triggers it.