Introduction
Learning when to use antes de versus antes que is a common challenge for English-speaking learners of Brazilian Portuguese. Both translate roughly as before in English, but they follow different grammar rules and affect verb forms. This article explains the differences clearly, with step-by-step rules, plenty of examples in Brazilian Portuguese, and helpful usage notes.
Overview: Why two forms?
Portuguese has two main ways to express before: antes de plus an infinitive or a noun, and antes que plus the subjunctive. The choice depends on whether the subject of the main clause and the subordinate clause is the same, and whether the action is expressed as a concrete event or a hypothetical/anticipated one.
Key idea in one line
Use antes de + infinitive when the subject of both verbs is the same or when you use a noun. Use antes que + subjunctive when the subjects are different or when the action is not yet realized and you want to express purpose, intention, or prevention.
Antes de: rules and examples
Antes de is followed by a noun or an infinitive. It is the safer option when the subject of the subordinate verb is the same as the main clause subject.
Structure with same subject
When the subject of the main clause and the subordinate clause is the same, use antes de + infinitive. The infinitive is unmarked for person, so there is no subjunctive conjugation.
Examples:
Eu lavo as mãos antes de comer.
Ela terminou o relatório antes de sair do escritório.
Structure with a noun
If you want to use a noun rather than a verb, use antes de + noun.
Examples:
Chegue cedo antes de a apresentação.
Precisamos revisar tudo antes de a entrega final.
Negative and modal contexts
Antes de is also natural with modal expressions and negatives where the infinitive stays the same.
Exemplos:
Não vá embora antes de conversar comigo.
Leia o contrato antes de assinar.
Antes que: rules and examples
Antes que is typically followed by the subjunctive mood because it expresses actions that are uncertain, hypothetical, or in the future relative to the main clause. Use it when the subject of the subordinate clause is different from the main clause or when the speaker presents the subordinate action as not yet realized.
Different subjects
When the subject changes between clauses, antes que + subjunctive is required.
Examples:
Feche a porta antes que eles cheguem.
Vamos sair antes que o trânsito piore.
Expressing prevention or urgency
Use antes que when you want to say preventively or to avoid something from happening. The subjunctive emphasizes the possibility of an outcome.
Exemplos:
Me avise antes que seja tarde demais.
Traga um guarda-chuva antes que comece a chover.
Subjunctive conjugations recap
For present subjunctive forms, the endings change depending on verb group. Here are quick examples with common verbs:
chegar: que eu chegue, que você chegue, que nós cheguemos, que eles cheguem
sair: que eu saia, que você saia, que nós saiamos, que eles saiam
piorar: que eu piore, que você piore, que nós pioremos, que eles piorem
Comparisons and minimal pairs
Comparing sentences side by side helps clarify the distinction. The difference often depends on whether the action has a distinct subject or whether the action is hypothetical.
Same subject vs different subject
Eu vou estudar antes de dormir.
Here the subject eu applies to both verbs, so use antes de + infinitive.
Feche a janela antes que faça frio.
The subject of fazer is impersonal weather, and there is a notion of prevention, so antes que + subjunctive is used.
Infinitive vs subjunctive nuance
Eu terminei o trabalho antes de vocês chegarem.
Even though chegarem is plural, the sentence more typically uses antes de with an infinitive when the subject is the same or when the speaker frames the event as already planned. However, with different subjects and a future or uncertain action, antes que is preferred: Eu terminei o trabalho antes que vocês chegam would be incorrect; correct is Eu terminei o trabalho antes que vocês chegassem if speaking in a narrative about prevention or expectation. Native usage often favors simpler constructs to avoid ambiguity.
Special cases and variations
Portuguese allows some flexibility in spoken Brazilian Portuguese, and native speakers sometimes prefer one form over the other depending on register, regional habits, and emphasis.
After expressions of time and sequence
When talking about sequences of events that are factual and completed, antes de + infinitive is common.
Exemplos:
Ele telefonou antes de partir.
Comemos antes de começar o filme.
When uncertainty is implied
When you imply uncertainty, possibility, or prevention, use antes que + subjunctive.
Exemplos:
Traga dinheiro extra antes que falte algum aparelho para pagar.
Faça isso agora antes que alguém perceba.
Informal spoken language
In casual Brazilian Portuguese, you may hear constructions that blur the rules, such as using antes de with a finite verb form in colloquial speech. While understandable, these are not standard grammar and should be avoided in formal writing or exams.
Practical tips for learners
Here are simple guidelines to decide which form to use when speaking or writing.
Tip 1: Check the subject
If the subject of the subordinate clause is the same as the main clause, use antes de + infinitive. If the subject changes, reach for antes que + subjunctive.
Tip 2: Think about certainty
If you talk about a definite, completed action or a planned sequence, prefer antes de. If you talk about a possible, anticipated, or prevented event, prefer antes que.
Tip 3: Use model sentences
Memorize a few common patterns to use as templates. For example:
Eu lavo as mãos antes de comer. (same subject, concrete action)
Feche a porta antes que eles entrem. (different subjects, prevention)
Tip 4: Watch for weather and impersonal verbs
When the subordinate verb is impersonal (like fazer for weather), use antes que + subjunctive in many cases: Traga um casaco antes que esfrie.
Common mistakes and how to avoid them
English speakers often translate before directly and choose the wrong structure. Here are typical errors and corrections.
Error: Using antes que with an infinitive
Incorrect: Vou sair antes que comer.
Correct: Vou sair antes de comer.
Error: Using antes de with a different subject and an infinitive
Incorrect: Feche a porta antes de eles chegarem. (This sounds off because subjects differ.)
Correct: Feche a porta antes que eles cheguem.
Error: Forgetting the subjunctive
Incorrect: Faça isso antes que ele vem.
Correct: Faça isso antes que ele venha.
Cultural and usage notes
Brazilian Portuguese speakers often rely on context and intonation to convey nuance. In everyday conversation, both constructions appear frequently, but formal writing tends to follow the grammar rules strictly. Using the subjunctive with antes que can sound more polite, urgent, or formal, while antes de is straightforward and neutral.
Note also that in European Portuguese there are subtle preferences and idiomatic uses that differ from Brazilian Portuguese, so when in doubt focus on Brazilian examples if that is your target variety.
Further reading and practice suggestions
To internalize these rules, read Brazilian Portuguese texts, listen to native speakers, and pay attention to contexts where prevention, urgency, or different subjects appear. Notice weather expressions, verbs of perception, and commands: these often require antes que with the subjunctive.
Conclusion
Mastering the difference between antes de and antes que comes down to two main checks: are the subjects the same, and is the action hypothetical or preventive? Use antes de + infinitive when the subject matches or when using a noun, and use antes que + subjunctive when subjects differ or when you express prevention, uncertainty, or anticipation. With exposure and targeted listening to Brazilian Portuguese, these choices will become intuitive.
