Purpose Clauses (Para Que, A Fim De Que) | Portuguese (Portugal) Grammar

A purpose clause answers the question why? by stating the goal of an action. "I studied hard in order to pass the exam." Portuguese splits this territory into two sharply different structures: one for when the two clauses share a subject (infinitive) and one for when they have different subjects (subjunctive). The wrong choice is not just stylistic — it is ungrammatical and confusing. This page lays out the system cleanly so you can pick the right construction every time.

The single most important rule

Portuguese splits purpose clauses based on subject identity.

Same subject in both clauses → infinitive. Different subjects → subjunctive.

Estudei muito para passar no exame.

I studied hard (in order) to pass the exam. (same subject: I)

O professor falou alto para que todos ouvissem.

The teacher spoke loudly so that everyone could hear. (different subjects)

In the first sentence, the person studying is the same person passing — one subject, infinitive. In the second, the teacher speaks but everyone hears — two different subjects, subjunctive.

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Before you pick the connector, ask: does the action in the purpose clause have the same subject as the main clause? Same subject means infinitive. Different subject means subjunctive.

Same-subject purpose: para + infinitive

When the subjects match, the simple preposition para plus the infinitive does all the work.

Vou ao supermercado para comprar pão.

I'm going to the supermarket to buy bread.

Ele poupou dinheiro para comprar uma casa.

He saved money to buy a house.

Levantei-me cedo para apanhar o comboio.

I got up early to catch the train.

Estudamos português para viver em Lisboa.

We are studying Portuguese to live in Lisbon.

This is by far the most common purpose construction in everyday Portuguese. It is compact, clear, and universally understood.

Other same-subject connectors

A fim de, de modo a, de forma a — more formal variants — also take the infinitive when the subject is shared.

Trabalhou a noite toda a fim de acabar o projeto.

He worked all night in order to finish the project.

Falei devagar de modo a fazer-me entender.

I spoke slowly so as to make myself understood.

Saiu cedo de forma a evitar o trânsito.

She left early so as to avoid the traffic.

These are near-synonyms with slightly different registers:

Connector	Register	Construction
para	neutral — everyday	para + inf
a fim de	formal / written	a fim de + inf
de modo a	formal	de modo a + inf
de forma a	formal	de forma a + inf
com o intuito de	very formal	com o intuito de + inf
com vista a	formal (legal/admin)	com vista a + inf

Reuniram-se com vista a encontrar uma solução.

They met with a view to finding a solution. (formal)

Decidiu mudar-se com o intuito de começar uma vida nova.

He decided to move with the intention of starting a new life. (literary)

Different-subject purpose: para que + subjunctive

When the main clause and purpose clause have different subjects, the connector switches to para que and the verb switches to the subjunctive.

Falei alto para que todos me ouvissem.

I spoke loudly so that everyone could hear me.

A mãe trabalhou muito para que os filhos pudessem estudar.

The mother worked hard so that her children could study.

Escrevo estas notas para que te lembres dos detalhes.

I'm writing these notes so that you remember the details.

Deixámos a porta aberta para que o gato entrasse.

We left the door open so that the cat could come in.

The subjunctive tense follows standard sequence-of-tenses logic: present subjunctive pairs with present/future main verbs; imperfect subjunctive pairs with past main verbs.

Main clause	Purpose clause
present / future / imperative	present subjunctive
preterite / imperfect / conditional	imperfect subjunctive
pluperfect	pluperfect subjunctive (rare)

Deixa a luz acesa para que o bebé não tenha medo.

Leave the light on so that the baby isn't scared. (present)

Deixei a luz acesa para que o bebé não tivesse medo.

I left the light on so that the baby wouldn't be scared. (past)

Other different-subject connectors

A fim de que, de modo que, de forma que — each with que — introduce subjunctive purpose clauses. They are more formal than plain para que.

Falei devagar a fim de que todos compreendessem.

I spoke slowly so that everyone would understand. (formal)

Escreveu as instruções de modo que ninguém se perdesse.

He wrote the instructions so that no one would get lost.

Preparámos tudo de forma que não houvesse surpresas.

We prepared everything so that there would be no surprises.

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De modo que / de forma que with the subjunctive expresses purpose (so that). With the indicative, they express result (so that, consequently). The mood you pick changes the meaning entirely. See complex/result-clauses.

A que + subjunctive: the formal variant

In very formal or literary registers, you will see a que + subjunctive as a purpose connector. This is rare in speech and mostly found in legal, academic, or ceremonial prose.

Tomou providências a que nada lhe faltasse.

She took measures (to the end) that he would lack nothing. (very formal)

Escrevi-lhes a que soubessem da decisão.

I wrote to them so that they would know the decision. (archaic/formal)

In modern Portuguese, para que does the same job more naturally.

When the purpose clause contains an obvious subject: the personal infinitive

Portuguese has a beautiful third option that English lacks entirely: the personal infinitive. When the subject of the purpose clause is overt but you want the compactness of an infinitive, the personal infinitive marks person on the verb.

Falou alto para todos o ouvirem.

He spoke loudly for everyone to hear him.

Trabalhei muito para vocês poderem viajar.

I worked hard for you to be able to travel.

Deixei a chave debaixo do tapete para tu entrares.

I left the key under the mat for you to come in.

Here, ouvirem, poderem, entrares are personal infinitives — the verb form marks the subject (todos, vocês, tu). This is a European Portuguese specialty and is very common in everyday speech.

Comparing the three structures

Consider how the same idea can be expressed three ways, each with a subtly different flavour:

Falei alto para ser ouvido.

I spoke loudly so as to be heard. (same subject, passive infinitive)

Falei alto para que todos me ouvissem.

I spoke loudly so that everyone could hear me. (different subject, subjunctive)

Falei alto para todos me ouvirem.

I spoke loudly for everyone to hear me. (different subject, personal infinitive)

All three are grammatical. The second and third are near-synonyms — European speakers often prefer the third for its lightness, while formal writing prefers the subjunctive.

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Whenever you are tempted to use para que + subjunctive in speech, consider whether para + personal infinitive flows more naturally. Para todos ouvirem is shorter and more native-sounding than para que todos ouçam.

Negative purpose clauses

To express that an action is taken to prevent something, Portuguese uses the same structures with a negative inside.

Saiu sem fazer barulho para não acordar o bebé.

She left quietly so as not to wake the baby. (same subject)

Fechei a porta para que ninguém entrasse.

I closed the door so that no one would come in. (different subject)

Escondi o telemóvel para não seres distraído.

I hid the phone so you wouldn't be distracted. (personal infinitive)

There is also a dedicated negative purpose connector: para que não, a fim de que não, sob pena de + infinitive (to avoid a penalty).

Estuda, sob pena de reprovares.

Study, or else you'll fail. (formal)

Não digas nada, sob pena de te despedirem.

Don't say anything, or they'll fire you.

Purpose with motion verbs

After verbs of motion (ir, vir, chegar, sair, partir), para + infinitive is the natural way to say in order to, often without any alternative.

Vou ao mercado comprar fruta.

I'm going to the market to buy fruit.

Vim falar contigo.

I came to talk to you.

Saímos para apanhar ar fresco.

We went out to get some fresh air.

Notice that after verbs of motion, Portuguese often drops para altogether: Vou ao mercado comprar fruta is more colloquial than Vou ao mercado para comprar fruta. Both are grammatical; the bare infinitive is breezier.

Purpose vs cause vs result

Three kinds of subordinate clauses can look alike but mean very different things.

Type	Question answered	Example
Purpose	Why? (for what goal)	Fechei a porta para não ouvir o barulho.
Cause	Why? (because of what)	Fechei a porta porque ouvia barulho.
Result	With what effect?	Fechei a porta com força, de modo que partiu o vidro.

A purpose clause expresses intent, oriented toward the future. A cause clause expresses reason, oriented toward the past. A result clause expresses consequence, oriented toward observation. The same conjunctions (de modo que, de forma que) can introduce either purpose or result — the subjunctive vs indicative distinction is what tells them apart.

Falou alto, de modo que todos ouvissem.

He spoke loudly, so that everyone would hear. (purpose, subjunctive)

Falou alto, de modo que todos ouviram.

He spoke loudly, so that everyone heard. (result, indicative)

Comparison with English

English uses two main markers for purpose: "to" (I went to buy bread) and "so that" (I closed the door so that he couldn't hear). Portuguese splits these more strictly on subject identity:

English "to" maps cleanly to Portuguese para
- infinitive (same subject).
English "so that" maps to Portuguese para que
- subjunctive (different subjects).

English speakers learning Portuguese routinely say para ele vir when they mean for him to come, which is correct as a personal infinitive. They also routinely say para que ele vem with the indicative, which is ungrammatical: para que demands the subjunctive (venha).

❌ Saí cedo para que ele me encontra no aeroporto.

Incorrect — para que requires the subjunctive

✅ Saí cedo para que ele me encontrasse no aeroporto.

I left early so that he could meet me at the airport.

Register summary

(informal/neutral): para
- infinitive, para que
  - subjunctive, para
    - personal infinitive.
(formal/written): a fim de (que), de modo a / de modo que, de forma a / de forma que.
(very formal/legal): com vista a, com o intuito de, a que
- subjunctive.
(literary/archaic): a fim de que, por forma a, sob pena de.

For everyday conversation, para does 95% of the work. For essays, reports, and careful writing, rotate through the formal variants to avoid monotony.

Purpose clauses with the subjunctive after motion?

A quick warning: some grammars of older Portuguese list que alone as a purpose conjunction after motion verbs, e.g. Vem cá que te veja (Come here so that I may see you). This is archaic / literary. In modern speech, you would say Anda cá para eu te ver (same subject? different subject? — here different: vem tu, veja eu).

Anda cá para eu te ver.

Come here so I can see you. (modern)

Vem cá que te veja.

Come here that I may see you. (archaic/literary)

Common Mistakes

❌ Estudei para que passar no exame.

Incorrect — same subject should use para + infinitive

✅ Estudei para passar no exame.

I studied to pass the exam.

❌ Falei alto para que todos me ouvem.

Incorrect — para que requires the subjunctive, not the indicative

✅ Falo alto para que todos me ouçam.

I speak loudly so that everyone hears me. (present + present subjunctive)

✅ Falei alto para que todos me ouvissem.

I spoke loudly so that everyone would hear me. (past + imperfect subjunctive)

❌ Trouxe o guarda-chuva para não me molhar a chuva.

Incorrect syntax — mixing two constructions

✅ Trouxe o guarda-chuva para não me molhar.

I brought the umbrella so as not to get wet.

✅ Trouxe o guarda-chuva para que a chuva não me molhasse.

I brought the umbrella so that the rain wouldn't get me wet.

❌ Escrevi-te para tu sabes a verdade.

Incorrect — after para with an overt subject, use the personal infinitive (saberes)

✅ Escrevi-te para tu saberes a verdade.

I wrote to you so you'd know the truth.

✅ Escrevi-te para que soubesses a verdade.

I wrote to you so that you'd know the truth.

❌ De modo que entendas, vou repetir.

Incorrect word order for purpose — purpose clause should follow the main verb

✅ Vou repetir, de modo que entendas.

I'll repeat it, so that you understand.

✅ Vou repetir para que entendas.

I'll repeat it so you understand.

Key Takeaways

Same subject: para (or a fim de, de modo a, de forma a) + infinitive.
Different subjects, finite: para que (or a fim de que, de modo que, de forma que) + subjunctive.
Different subjects, compact: para
- personal infinitive — a uniquely Portuguese option, lighter than the subjunctive.
Never use the indicative after para que. The subjunctive is obligatory.
De modo que / de forma que
- subjunctive = purpose; + indicative = result. Same words, different moods, different meanings.
In speech, para does most of the work. Formal writing rotates through a fim de (que), de modo a / que, de forma a / que, com vista a.
Negative purpose: simply negate inside the clause (para não acordar, para que não venha, sob pena de).
English "to" maps to para
- inf (same subject); English "so that" maps to para que
  - subj or para
    - personal inf (different subjects).