B2 · 中高级 章节 15

Setting Conditions and Time Limits

5 总规则
52 例句
6 分钟
本章规则 快速练习

Chapter in 30 Seconds

Master the art of setting conditions and time limits to sound like a native Portuguese speaker.

  • Connect sentences using advanced conjunctions like 'antes que' and 'caso'.
  • Apply the subjunctive mood to express conditions, limitations, and future possibilities.
  • Construct complex sentences that convey nuance and precision in professional or casual settings.
Command the conversation with precision and elegant conditions.

你将学到什么

Get ready to level up your Portuguese! This chapter isn't just about simple sentences; it's about adding precision and nuance to your conversations, making you sound much more like a native speaker. Imagine you're making plans with a friend and want to say, 'I can't come unless I have money' or 'We're going for a picnic, unless it rains.' Here, you'll master how to express these exact conditions and time limits using powerful conjunctions. You'll dive into phrases like 'antes que' (before), 'a não ser que' (unless), 'contanto que' (as long as), 'sem que' (without/unless), 'caso' (in case), and 'a menos que' (unless). These aren't just words; they're your secret weapons for expressing complex ideas. Crucially, you'll learn how these conjunctions act as triggers, always pulling the next verb into the subjunctive mood – a hallmark of advanced Portuguese. Discover how 'antes que' helps you set clear deadlines, especially when different subjects are involved, or how 'caso' allows you to articulate 'in case' scenarios with elegance. And with 'sem que', you'll effortlessly express actions that happen 'without' something else occurring. By the end of this chapter, you won't just be understood; you'll be able to communicate your plans, express nuanced proposals, and set conditions with the confidence and accuracy of a true B2 speaker. Your conversations will gain depth, impressing everyone with your mastery of Portuguese. Ready to fine-tune your expression?

Learning Objectives

By the end of this chapter, you will be able to:

  1. 1
    By the end you will be able to: Use subjunctive triggers to create conditional sentences in both Brazilian and European Portuguese.

章节指南

Overview

Welcome to an exciting chapter designed to significantly boost your Portuguese grammar B2 skills! As you progress in your language journey, moving beyond basic sentences becomes crucial. This guide is your key to unlocking more complex and nuanced expressions, helping you sound more natural and sophisticated.
We’re diving deep into how to set conditions and time limits in Portuguese, equipping you with the tools to express ideas like "I can't go unless I finish my work or Let's meet before it gets dark."
This chapter focuses on powerful conjunctions that act as triggers for the subjunctive mood, a hallmark of advanced Portuguese. You’ll master phrases such as antes que (before), a não ser que (unless), contanto que (as long as), sem que (without/unless), caso (in case), and a menos que (unless). Understanding these isn't just about memorizing words; it's about learning how to structure your thoughts to convey specific conditions, possibilities, and restrictions.
By the end, you'll be able to communicate your plans, express detailed proposals, and set conditions with the precision expected of a CEFR B2 speaker. Get ready to elevate your conversations and impress with your command of Portuguese!

How This Grammar Works

At the heart of this chapter is the subjunctive mood. The conjunctions we're exploring are classic subjunctive triggers, meaning the verb immediately following them must be in the subjunctive. This is essential for expressing hypothetical situations, desires, doubts, and conditions.
Let's break down these powerful connectors:
* Subjunctive Triggers: The 'A' List (Antes que, A não ser que, A menos que)
* Antes que (before): This conjunction is used to set a time limit or a deadline, particularly when the subject of the main clause is different from the subject of the subordinate clause.
* Vou sair antes que chova. (I will leave before it rains.)
* A não ser que and A menos que (unless): Both convey a negative condition, meaning if not or except if. They are largely interchangeable in most contexts.
* Não vou viajar a não ser que tenhas dinheiro. (I won't travel unless you have money.)
* Não vamos a menos que ele venha. (We're not going unless he comes.)
* Portuguese Conditionals: 'As long as' (contanto que)
* Contanto que (as long as / provided that): This phrase introduces a condition that must be met for something else to happen. It's perfect for expressing agreement or setting a prerequisite.
* Eu ajudo-te, contanto que me ajudes também. (I'll help you, as long as you help me too.)
* Using 'Sem que': Without/Unless with Subjunctive
* Sem que (without / unless): This conjunction often means without something happening or can sometimes be used similarly to unless in specific contexts, emphasizing the absence of a condition.
* Ele saiu sem que ninguém o visse. (He left without anyone seeing him.)
* Não posso terminar o projeto sem que me dês os dados. (I can't finish the project unless you give me the data.)
* Portuguese: How to say 'In case' (Caso + Subjunctive)
* Caso (in case): This is used to introduce a potential future event or situation, suggesting a precaution or a contingency plan.
* Leva um casaco caso faça frio. (Take a jacket in case it gets cold.)
Mastering these structures will significantly enhance your ability to express complex ideas and conditions in Portuguese grammar.

Common Mistakes

  1. 1✗ Wrong:
    Vou sair antes que chove.
✓ Correct:
Vou sair antes que chova.
*Explanation:* The conjunction antes que always triggers the subjunctive mood in the following verb. Chove is indicative, while chova is subjunctive.
  1. 1✗ Wrong:
    Não te empresto dinheiro a menos que tu me devolves.
✓ Correct:
Não te empresto dinheiro a menos que tu me devolvas.
*Explanation:* Similar to antes que, a menos que (and a não ser que) require the subjunctive. Devolves is indicative, devolvas is subjunctive.
  1. 1✗ Wrong:
    Leva um guarda-chuva caso vai chover.
✓ Correct:
Leva um guarda-chuva caso chova.
*Explanation:* Caso always introduces a clause where the verb must be in the subjunctive mood. Vai chover (or chove) is indicative; chova is subjunctive.

Real Conversations

A

A

Vamos jantar fora hoje à noite, a não ser que estejamos muito cansados. (Let's eat out tonight, unless we're too tired.)
B

B

Boa ideia! Contanto que não seja demasiado caro, estou dentro. (Good idea! As long as it's not too expensive, I'm in.)
A

A

Devíamos reservar os bilhetes antes que esgotem. (We should book the tickets before they sell out.)
B

B

Sim, caso haja algum problema com a reserva, podemos ligar para lá. (Yes, in case there's any problem with the reservation, we can call them.)
A

A

Ele nunca faz nada sem que eu lhe peça. (He never does anything without me asking him.)
B

B

É verdade, a menos que seja algo que lhe interesse muito. (That's true, unless it's something that really interests him.)

Quick FAQ

Q

What's the main difference between a não ser que and a menos que?

A: In most contexts, a não ser que and a menos que are interchangeable, both meaning unless and requiring the subjunctive. There might be subtle regional preferences, but grammatically, they function the same.

Q

Does caso always require the subjunctive?

A: Yes, when caso means in case or if (introducing a hypothetical condition), the verb that follows it must always be in the subjunctive mood.

Q

Can I use antes que if the subject is the same in both clauses?

A: While possible, it's more common and often more natural to use antes de + infinitive when the subject is the same. For example,

Vou sair antes de chover
(I will leave before it rains) is less common than
Vou sair antes que chova
when the subject of chover is implicit (it). If the subjects are explicitly different, antes que + subjunctive is the only option.

Cultural Context

In Portuguese conversations, these conditional and time-limiting conjunctions are vital for expressing politeness, making plans, and conveying nuances. Native speakers use them constantly to soften requests, propose alternatives, or state clear boundaries without sounding abrupt. For instance, using contanto que allows for a polite way to set a condition for agreement, while caso is indispensable for preparing for contingencies, showing foresight and care.
Mastering these structures not only improves your Portuguese grammar but also enhances your ability to engage in more sophisticated and socially appropriate interactions.

关键例句 (6)

1

Vou cancelar o Uber, a não ser que você esteja pronta.

我要取消 Uber 了，除非你已经准备好了。

虚拟语气触发词：'A' 类列表 (Antes que, A não ser que)
2

Posta a foto antes que a gente mude de ideia.

趁我们还没改变主意，快把照片发了。

虚拟语气触发词：'A' 类列表 (Antes que, A não ser que)
3

Ele entrou na sala sem que ninguém percebesse.

He entered the room without anyone noticing.

使用 'Sem que'：带虚拟语气的“不/除非”
4

Não posto nada no Instagram sem que você aprove primeiro.

I don't post anything on Instagram without you approving it first.

使用 'Sem que'：带虚拟语气的“不/除非”
5

Eu não vou sair de casa a menos que pare de chover.

除非雨停了，否则我不会出门。

否定条件：除非 (A menos que)
6

O download não vai terminar a menos que você conecte o Wi-Fi.

除非你连接 Wi-Fi，否则下载不会完成。

否定条件：除非 (A menos que)

技巧与窍门 (4)

💡

“Que” 是关键信号

如果你在连词后面看到了 'que'，你的虚拟式雷达就该响了，这几乎就是定死的要求：
É importante que você saiba disso.
frontend.learn_grammar.from_rule: 虚拟语气触发词：'A' 类列表 (Antes que, A não ser que)
🎯

“SS” 记忆大法

如果你的主句是过去时，虚拟式也要用带 **SS** 的形式（未完成过去虚拟式：fize**ss**e, fala**ss**e）。视觉上非常统一，好记吧！例如：
Eu saí antes que ela chegasse.
frontend.learn_grammar.from_rule: Antes que: “与时间赛跑”连接词 (虚拟语气)
💡

Subject Check

Always check if the subject is the same. If yes, use the infinitive to sound more natural.
frontend.learn_grammar.from_rule: 使用 'Sem que'：带虚拟语气的“不/除非”
🎯

‘Se’ 与 ‘Caso’ 的切换大法

如果你觉得虚拟式现在时有点难，通常可以用 'Se' + 虚拟式将来时来代替。但用 'Caso' 会让你的葡语显得更成熟、更有准备！比如：Caso você queira 听起来比 Se você quiser 更讲究。
frontend.learn_grammar.from_rule: 葡萄牙语：如何表达“万一/如果”（Caso + 虚拟式）

核心词汇 (6)

antes que before a não ser que unless contanto que as long as sem que without caso in case a menos que unless

Real-World Preview

sun

Planning a Picnic

Review Summary

  • Conjunction + Subjunctive Verb
  • Antes que + Subjunctive
  • Sem que + Subjunctive
  • Caso + Subjunctive
  • A menos que + Subjunctive

常见错误

'Antes que' requires the subjunctive. 'Chega' is indicative.

Wrong: Eu vou antes que ele chega.
正确: Eu vou antes que ele chegue.

After 'caso', always use the present subjunctive form 'precise'.

Wrong: Caso você precisa de ajuda, me avise.
正确: Caso você precise de ajuda, me avise.

'A menos que' triggers the subjunctive 'venha'.

Wrong: Iremos a menos que ele vem.
正确: Iremos a menos que ele venha.

Next Steps

You have done an amazing job today! Keep practicing these structures in your daily speaking.

Write 5 sentences about your future plans using the new conjunctions.

Continue to: Dreaming with the Imperfect Subjunctive

快速练习 (10)

哪句话使用了正确的语式？

选择语法正确的句子：

✓ Correct! ✗ Not quite. Correct answer: Não vou a menos que você vá.
'Vai' 是陈述式，'ir' 是不定式。我们需要虚拟式 'vá'。

frontend.learn_grammar.from_rule: 否定条件：除非 (A menos que)

哪个句子表达的是假设动作？

翻译："在他离开前说话。"

✓ Correct! ✗ Not quite. Correct answer: Fala antes que ele saia.
'Antes que' 要求接虚拟式 'saia'。选项 3 虽然语法通顺，但选项 1 是最标准的触发词用法。

frontend.learn_grammar.from_rule: 虚拟语气触发词：'A' 类列表 (Antes que, A não ser que)

找出并修正句子中的错误。

Find and fix the mistake:

Eu compraria a camisa a menos que custa muito caro.

✓ Correct! ✗ Not quite. Correct answer: Eu compraria a camisa a menos que custasse muito caro.
由于主句动词 'compraria' 是条件式（would buy），'unless' 从句需要使用虚拟式未完成过去时 'custasse'。

frontend.learn_grammar.from_rule: 否定条件：除非 (A menos que)

用正确的虚拟式形式填空。

Vou terminar o relatório antes que o chefe ___ (chegar).

✓ Correct! ✗ Not quite. Correct answer: chegue
因为主句动词是 'Vou terminar'（将来意图），我们使用现在虚拟式 'chegue'。

frontend.learn_grammar.from_rule: Antes que: “与时间赛跑”连接词 (虚拟语气)

Correct the error in the sentence.

Find and fix the mistake:

Ela fez o bolo sem que ninguém pede.

✓ Correct! ✗ Not quite. Correct answer: pedisse
Imperfect subjunctive required.

frontend.learn_grammar.from_rule: 使用 'Sem que'：带虚拟语气的“不/除非”

选择语法正确的句子。

哪句话正确使用了过去时语境？

✓ Correct! ✗ Not quite. Correct answer: Eu saí antes que ela chegasse.
因为 'saí' 是过去时，后面的动词必须用未完成过去虚拟式 ('chegasse')。

frontend.learn_grammar.from_rule: Antes que: “与时间赛跑”连接词 (虚拟语气)

找出短信中的错误

Eu vou comprar, a menos que está muito caro.

✓ Correct! ✗ Not quite. Correct answer: Eu vou comprar, a menos que esteja muito caro.
在 'a menos que' 之后不能使用陈述式 'está'，必须使用虚拟式 'esteja'。

frontend.learn_grammar.from_rule: 虚拟语气触发词：'A' 类列表 (Antes que, A não ser que)

找出并修正变位错误。

Find and fix the mistake:

Compre o ingresso antes que acaba.

✓ Correct! ✗ Not quite. Correct answer: Compre o ingresso antes que acabe.
'Acaba' 是陈述式。 'Antes que' 要求使用虚拟式 'acabe'。

frontend.learn_grammar.from_rule: Antes que: “与时间赛跑”连接词 (虚拟语气)

Choose the correct sentence.

Which sentence is correct?

✓ Correct! ✗ Not quite. Correct answer: Eu saí sem ver.
Same subject requires infinitive.

frontend.learn_grammar.from_rule: 使用 'Sem que'：带虚拟语气的“不/除非”

用动词的正确形式填空。

Não vamos à praia a menos que ___ sol. (fazer)

✓ Correct! ✗ Not quite. Correct answer: faça
因为有 'a menos que'，我们需要动词 'fazer' 的虚拟式现在时形式。

frontend.learn_grammar.from_rule: 否定条件：除非 (A menos que)

Score: /10

常见问题 (6)

非常常用！无论是口头还是书面，定计划时经常听到：
Vamos, a não ser que chova.
不可以。'antes que' 和 'a não ser que' 通常接虚拟式现在时。将来时主要留给 'se' 或 'quando'：Se você for...
是的，100% 确定。因为“之前”发生的事情相对于主句动词来说还没发生，它被视为一种预期或假设。例如：
Vou antes que ele chegue.
不行。虽然它指的是未来，但 antes que 严格要求使用现在虚拟式。将来虚拟式通常留给 'quando' (当...) 或 'se' (如果...) 从句。
Antes que eu vá.
It introduces a negative or hypothetical event, which is a classic trigger for the subjunctive mood in Portuguese.
Grammatically, no. While some native speakers do it in very casual speech, it is considered incorrect in standard Portuguese.
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Triggers: Doubt and Impersonal Opinions
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Dreaming with the Imperfect Subjunctive
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