Introduction
Understanding subordinate clauses is a key step to move from simple sentences to natural, fluent Portuguese. This guide explains Portuguese subordinate clause rules and examples for learners, with clear steps, useful examples in Brazilian Portuguese, and notes on common pitfalls. By the end you will recognize and form the main types of subordinate clauses used in everyday speech and writing.
- What is a subordinate clause?
- Types of subordinate clauses
- Direct and indirect speech as subordinate clauses
- Relative pronouns and agreement
- Punctuation and word order
- Cultural and usage notes
- Common learner mistakes and how to avoid them
- Putting it all together: complex sentence examples
- Quick reference: common subordinating conjunctions
- Study tips for learners
- Conclusion
What is a subordinate clause?
A subordinate clause is a group of words that has a subject and a verb but depends on a main clause to form a complete idea. In Portuguese, subordinate clauses appear after conjunctions or relative pronouns and add detail about time, cause, purpose, condition, result, or content.
Key terms
The first time we introduce an important term, we format it as required. A subordinate clause in Portuguese is called oração subordinada. Other useful terms: oração principal (main clause), conjunção subordinativa (subordinating conjunction), and pronome relativo (relative pronoun). Later we will use oração subordinada and oração principal for repeated references.
Types of subordinate clauses
Portuguese has several common types of oração subordinada: substantiva (noun), adjetiva (relative), adverbial (expressing time, cause, condition, purpose, concession, etc.), and reduzida (reduced infinitive or participle forms). Each type follows particular rules about word order, verb forms, and punctuation.
1. Oração subordinada substantiva (noun clause)
An oração subordinada substantiva functions like a noun: it can act as subject, object, or complement. It is often introduced by the conjunctions que or se.
Examples:
Como sujeito:
Que ele chegou era uma surpresa para todos. -> Que ele chegou was a surprise for everyone.
Como objeto direto:
Eu sei
que você estuda bastante. -> I know que você estuda bastante.
After verbs of doubt or indirect speech, use oração subordinada substantiva with que or se: Eu perguntei se ele viria. Note that when the noun clause is subject and begins the sentence, it is often followed by verb in third person.
2. Oração subordinada adjetiva (relative clause)
An oração subordinada adjetiva modifies a noun and is introduced by a relative pronoun such as que, quem, o qual, cuja, onde. There are two main types: restrictive (especificativa) and non-restrictive (explicativa).
Restrictive example (limits meaning):
O livro
que eu comprei está na mesa. -> The book that I bought is on the table.
Non-restrictive example (adds extra info, usually set off by commas):
João,
que mora aqui, é meu vizinho. -> João, who lives here, is my neighbor.
Usage note: In Brazilian Portuguese, que is the most common relative pronoun in spoken language. Use o qual and cuja in formal writing or when avoiding ambiguity.
3. Oração subordinada adverbial (adverbial clause)
Oração subordinada adverbial indicates time, cause, condition, purpose, concession, consequence, comparison, etc. Each subtype uses specific conjunctions and sometimes different verb moods.
Time (temporal)
Common conjunctions: quando, enquanto, assim que, logo que, desde que.
Example:
Eu ligo para você
quando eu chegar. -> I will call you when I arrive.
Cause (causal)
Conjunctions: porque, já que, visto que, pois que.
Example:
Não fomos à praia
porque estava chovendo. -> We did not go to the beach because it was raining.
Condition (condicional)
Conjunctions: se, caso, desde que, contanto que.
Example:
Se você estudar, vai passar no exame. -> If you study, you will pass the exam.
Purpose (final)
Conjunctions: para que, a fim de que.
Example:
Estudo muito
para que eu possa conseguir uma bolsa. -> I study a lot so that I can get a scholarship.
Concession (concessiva)
Conjunctions: embora, apesar de que, ainda que.
Example:
Ainda que esteja cansado, ele trabalha até tarde. -> Although he is tired, he works late.
Consequence (consecutiva)
Conjunctions: de modo que, de sorte que, tanto que.
Example:
Choveu tanto que a rua alagou. -> It rained so much that the street flooded.
Mood and tense inside adverbial clauses
Portuguese often requires the subjunctive mood in adverbial clauses that express doubt, desire, hypothesis, concession, or purpose. Use the indicative for facts or certainty.
Compare:
Fact (indicative):
Eu sei que ele vem amanhã. -> I know he is coming tomorrow.
Uncertainty or desire (subjunctive):
Espero que ele venha amanhã. -> I hope he comes tomorrow.
Conditional phrases with se use the indicative for real conditions and the subjunctive for hypothetical/future less-likely situations. Example: Se eu tiver tempo, vou à festa (indicative future sense). Se eu tivesse dinheiro, viajaria mais (imperfect subjunctive for hypothetical present).
4. Orações subordinadas reduzidas (reduced clauses)
Reduced clauses lack an explicit conjunction and often use the infinitive, gerund, or past participle. They are common in formal and spoken Portuguese to make sentences shorter.
Infinitive reduced clause (subject understood):
Chegando cedo, conseguimos bons lugares. -> Arriving early, we got good seats.
Gerund reduced clause (continuous action):
Saindo do trabalho, encontrei um amigo. -> Coming out of work, I met a friend.
Past participle used as adjective or passive: Produtos vendidos rapidamente. -> Products sold quickly.
Note: Reduced clauses must agree logically with the subject of the main clause to avoid dangling modifiers. Incorrect: Saindo do carro, a chuva começou. This seems to say the rain was leaving the car.
Direct and indirect speech as subordinate clauses
Reported speech uses oração subordinada substantiva introduced by que or se. In Portuguese, sequence of tenses matters when the main verb is in the past.
Direct: Ele disse, Eu vou amanhã. -> Indirect: Ele disse que iria no dia seguinte. The present vou becomes iria in reported past because of sequence of past tenses.
If the reporting verb is in the present, tense change is not mandatory: Ele diz que vai amanhã.
Relative pronouns and agreement
Relative pronouns link a noun to a clause. The most frequent is que, used for people and things. Use quem for people after prepositions or when referring to someone with an implied idea of person.
Examples:
A pessoa
quem conheci foi simpática. -> The person I met was nice. (Note: In spoken Portuguese, quem often replaces o qual in casual contexts.)
O lugar
onde estudamos é calmo. -> The place where we study is quiet.
Agreement: When the relative pronoun refers to a person and the clause has a possessive relation, use cuja which agrees with the possessed noun: A menina cuja bicicleta foi roubada estava triste. -> The girl whose bike was stolen was sad.
Punctuation and word order
Non-restrictive relative clauses use commas. Restrictive clauses do not. Example with commas: Meu irmão, que mora em São Paulo, vem visitar. Without commas: O jogador que marcou o gol é ótimo. Commas change whether the information is essential or additional.
Subordinate clauses usually follow the main clause, but they can precede it for emphasis. When an oração subordinada starts the sentence, maintain comma separation when needed: Quando eu terminei, descansei. In formal writing, keep clear punctuation to show clause boundaries.
Cultural and usage notes
In Brazilian Portuguese conversation, speakers often favor simpler subordinating structures and use que and se frequently. The subjunctive mood appears more in formal speech and specific expressions. Colloquial speech also omits relative pronouns when the meaning stays clear: O filme que vimos ontem foi ótimo often becomes O filme que a gente viu ontem foi ótimo or simply O filme que vimos ontem foi ótimo in speech—this shows flexibility but be careful in formal writing.
Brazilian Portuguese prefers the personal infinitive in some contexts where European Portuguese uses a different structure. Example: Antes de nós sairmos -> Antes de sairmos. Personal infinitive expresses a subject explicitly: Para eu falar bem, preciso praticar -> Para eu falar bem, preciso praticar.
Common learner mistakes and how to avoid them
1. Using the wrong mood: After desejo, dúvida, or sentimento, prefer the subjunctive. Incorrect: Espero que você vem amanhã. Correct: Espero que você venha amanhã.
2. Misplacing reduced clauses: Make sure the reduced clause matches the subject of the main clause. Incorrect: Entrando na sala, a luz apagou. Correct: Ao entrar na sala, percebi que a luz apagou. or Quando entrei na sala, a luz apagou.
3. Punctuation with relative clauses: Overuse or underuse of commas can change meaning. Decide whether the clause is essential or extra information and punctuate accordingly.
Putting it all together: complex sentence examples
Example combining noun, adverbial, and relative clauses:
Eu sei
que ele chegou tarde, embora tenha avisado que ficaria preso no trânsito, e o carro
que estava estacionado ficou sem luz. -> I know that he arrived late, although he warned he would be stuck in traffic, and the car that was parked lost power.
Example using subjunctive in a purpose clause and a reduced clause:
Estudo para que eu
possa conseguir um emprego melhor, lendo artigos e ouvindo podcasts. -> I study so that I can get a better job, reading articles and listening to podcasts.
Quick reference: common subordinating conjunctions
Use this short list as a memory aid. Each conjunction signals a clause type and sometimes a required mood.
que – noun and relative clauses
se – condition / indirect question
quando, enquanto – time
porque, já que – cause
para que, a fim de que – purpose (subjunctive)
ainda que, embora – concession (subjunctive often used)
de modo que, tanto que – consequence
Study tips for learners
1. Read Brazilian Portuguese texts and highlight subordinate clauses, noting their conjunctions and moods.
2. Practice transforming sentences: turn direct speech into reported speech, expand simple sentences with adverbial clauses, or reduce full clauses to infinitive/gerund forms.
3. Listen to native speakers to hear natural clause placement and colloquial reductions, then mimic aloud to internalize rhythm and connectors.
Conclusion
Mastering oração subordinada structures helps you build more complex and natural Portuguese sentences. Focus on recognizing clause types, choosing the correct conjunction and mood, and using punctuation to clarify meaning. With practice, subordinated clauses will become tools for clearer expression in both spoken and written Brazilian Portuguese.
