desde que

The Portuguese conjunction desde que is a versatile linguistic bridge that serves two primary functions: establishing a temporal starting point (meaning 'since') and setting a conditional requirement (meaning 'provided that' or 'as long as'). Understanding the difference between these two is the hallmark of a proficient Portuguese speaker. In the context of this lesson, we focus on its conditional use, which is essential for expressing terms, agreements, and personal boundaries. When used as a condition, it almost always triggers the Present Subjunctive or the Future Subjunctive, depending on the certainty and timing of the action. This makes it a slightly more advanced structure than the simple 'se' (if), adding a layer of sophistication to your speech. Native speakers use it constantly in negotiations, making plans, and setting rules. For instance, a parent might say to a child that they can go out, desde que they finish their homework first. This 'provided that' nuance is slightly more formal than 'se' but remains very common in everyday European and Brazilian Portuguese.

Temporal Meaning

Refers to a point in time. Example: 'Eu moro aqui desde que nasci' (I have lived here since I was born). Here, the indicative mood is used because it is a fact.

Conditional Meaning

Refers to a requirement. Example: 'Eu vou à festa desde que tu vás comigo' (I will go to the party provided that you go with me). Here, the subjunctive mood is required.

In professional settings, desde que is the standard way to outline clauses in a contract. It sounds more precise than the colloquial 'se'. If you are at a business meeting and want to say 'We will sign the contract provided the price is right,' you would use 'Assinaremos o contrato desde que o preço seja justo.' Notice the use of 'seja' (subjunctive of ser). This grammatical nuance is what separates A2 learners from B1/B2 speakers. In Brazil, you might hear it shortened in very informal speech, but the full form is always preferred in writing and standard conversation. Culturally, Portuguese speakers value clarity in conditions, and using desde que signals that the condition is non-negotiable or a specific prerequisite for the main action to occur. It creates a logical flow in storytelling and argumentation, allowing the speaker to layer their thoughts effectively.

Register Note

While 'desde que' is standard, in very formal legal Portuguese, you might encounter 'contanto que', which is almost an exact synonym but carries a heavier, more literary weight.

When exploring the streets of Lisbon or São Paulo, you will hear this conjunction in various contexts. From a waiter saying you can sit at a reserved table 'desde que termine antes das oito' (as long as you finish before eight) to a friend agreeing to help you move 'desde que me dês uma cerveja depois' (provided you give me a beer afterwards). It is a word that builds social contracts. It is not just about grammar; it is about the social dynamics of 'if-then' scenarios. By mastering desde que, you gain the ability to set boundaries politely and clearly, which is a vital skill in any language but especially in the warm yet direct social culture of Lusophone countries.

Using desde que correctly requires a basic understanding of Portuguese verb moods. When you use it to mean 'provided that', you are entering the realm of the hypothetical or the conditional future. This necessitates the use of the Subjunctive Mood. If you are talking about a general rule or a future possibility, the Present Subjunctive is your best friend. For example, if you want to say 'I will go as long as it doesn't rain', you say 'Eu vou, desde que não chova'. The verb 'chover' changes to 'chova'. This is a crucial distinction because using the indicative 'chove' would sound grammatically incorrect to a native ear and might even confuse the meaning, potentially making it sound like you are saying 'Since it doesn't rain' (temporal).

Sentence Structure 1: Future Condition

[Main Clause] + desde que + [Subordinate Clause in Present Subjunctive]. Example: Compro o livro desde que não seja caro.

Sentence Structure 2: Past Temporal

[Main Clause] + desde que + [Subordinate Clause in Indicative]. Example: Ele está triste desde que ela partiu.

One of the most common ways to use this conjunction is in the middle of a sentence to connect two ideas, but it can also start a sentence for emphasis. If you start with 'Desde que...', the second part of the sentence must follow with the result. For example: 'Desde que estudes, vais passar no exame' (As long as you study, you will pass the exam). This inversion is common in persuasive writing or when giving advice. It places the condition right at the forefront of the listener's mind. In European Portuguese, there is a slight tendency to use the future subjunctive more frequently with 'desde que' when the condition is perceived as a future event that will definitely happen at some point, though the present subjunctive remains the standard for general conditions.

Furthermore, desde que can be used with compound tenses. 'Eu teria ido, desde que tivesses pedido' (I would have gone, provided you had asked). This uses the Preterite Imperfect Subjunctive, showing that the condition was in the past and was not met. This level of usage is common in more advanced literature and formal debate. For an A2 learner, focusing on the Present Subjunctive is the priority. Think of it as a contract: 'I will do X, desde que you do Y'. This mental model helps in placing the verb in the correct mood. Always remember that the condition is the 'dependent' part of the sentence—it is what 'since' or 'provided' is attached to.

Common Verb Pairings

Commonly followed by verbs like 'ser' (seja), 'ter' (tenha), 'fazer' (faça), and 'poder' (possa) in the subjunctive mood.

The phrase desde que is omnipresent in the Lusophone world, appearing in everything from pop songs to legal statutes. If you listen to Fado or Bossa Nova, you will often hear it used in its temporal sense to describe the passage of time since a loved one left. However, in modern daily life, its conditional use is perhaps even more frequent. You will hear it in the workplace when managers discuss project requirements: 'The project will be approved desde que the budget is respected.' It is also a staple of Portuguese television news, where journalists use it to explain the conditions under which a new law will take effect or a diplomatic agreement will be signed.

In the Kitchen

'Podes substituir o azeite por manteiga, desde que não uses muita.' (You can replace olive oil with butter, as long as you don't use much.)

At the Office

'A reunião será produtiva desde que todos participem.' (The meeting will be productive provided that everyone participates.)

In Brazil, desde que is frequently used in telenovelas to create dramatic tension. A character might say, 'I will marry you, desde que you tell me the truth about your past.' This highlights the word's role in establishing high-stakes conditions. In Portugal, you might hear it more often in the context of bureaucracy or formal instructions. For instance, when applying for a visa or a residency permit, the instructions might state that the document is valid desde que the applicant remains in the country for a certain period. Its versatility makes it a favorite for speakers who want to sound clear and authoritative without being overly aggressive.

Interestingly, in the digital age, desde que has found its way into Terms and Conditions pages and app interfaces. 'You can use this software for free desde que it is for non-commercial use.' This demonstrates its continued relevance in modern, technical Portuguese. Whether you are reading a classic novel by Machado de Assis or a modern blog post about travel, you will encounter this conjunction. It is a fundamental building block of the language that allows for the expression of complex logical relationships. By paying attention to how it is used in movies and podcasts, you will start to pick up the rhythmic cadence it gives to a sentence, making your own Portuguese sound much more natural and fluid.

In Music

Songs often use 'desde que te perdi' (since I lost you). Note the past tense indicative here, contrasting with the conditional usage.

The most frequent mistake learners make with desde que is failing to use the subjunctive mood when expressing a condition. Because 'desde que' also means 'since' (temporal), which uses the indicative, learners often carry that indicative mood over to the conditional meaning. For example, saying 'Vou à festa desde que tu vais' instead of the correct 'desde que tu vás'. This is a major error because the indicative 'vais' makes the sentence sound like you are saying 'I am going to the party since you are going,' which changes the logic from a condition to a reason. This distinction is vital for being understood correctly in Portuguese-speaking environments.

Mistake: Mood Confusion

Using Indicative for conditions. Correct: 'desde que possas'. Incorrect: 'desde que podes'.

Mistake: Omitting 'Que'

Using 'desde' alone to mean 'provided that'. 'Desde' only means 'since' or 'from'. You must include 'que' for the conjunction.

Another common error is confusing desde que with visto que or já que (since/because). While in English 'since' can mean 'because' (e.g., 'Since you're here, help me'), in Portuguese, desde que is almost never used in this causal way. If you want to say 'since' as in 'because', you should use 'já que' or 'visto que'. Using desde que in this context will confuse native speakers, who will be waiting for either a time-based statement or a condition. For example, 'Já que estás aqui, ajuda-me' is correct, whereas 'Desde que estás aqui, ajuda-me' sounds like 'Ever since you have been here, help me', which is logically awkward.

Lastly, some learners struggle with the placement of pronouns when using desde que. In European Portuguese, 'que' is a 'magnet word' that pulls clitic pronouns to the front of the verb (proclisis). For example, 'desde que me digas' is correct, while 'desde que digas-me' is incorrect. In Brazilian Portuguese, this is less of an issue as pronouns generally come before the verb anyway, but for those learning the Continental variety, this is a subtle but important rule to remember. Mastering these small details will make your Portuguese sound much more authentic and prevent the 'foreigner's accent' in your grammar.

Mistake: Pronoun Placement (EP)

Incorrect: 'desde que fales-me'. Correct: 'desde que me fales'. The 'que' attracts the pronoun.

To truly master Portuguese, you need to know the synonyms and alternatives for desde que. The most direct synonym for its conditional use is contanto que. While 'desde que' is widely used in both speech and writing, 'contanto que' is slightly more formal and often found in literature or legal documents. Both require the subjunctive mood. Another alternative is the simple se (if). While 'se' is the most common way to express a condition, it doesn't carry the same 'as long as' or 'provided that' weight. 'Se' is neutral, whereas 'desde que' implies a specific prerequisite or a duration of the condition.

Contanto que

Very similar to 'desde que'. Formal. Requires subjunctive. Example: 'Contanto que faças o teu trabalho, tudo correrá bem.'

A menos que / A não ser que

Meaning 'unless'. These are the negative counterparts. They also require the subjunctive. Example: 'Não vou, a menos que me convides.'

When using desde que in its temporal sense ('since'), alternatives include desde (preposition) or a partir de (starting from). For example, 'desde ontem' (since yesterday) or 'a partir de agora' (from now on). It is important to distinguish between these time markers and the conjunction. Another word often confused is enquanto (while). While 'desde que' can sometimes imply 'as long as' in a temporal sense, 'enquanto' strictly refers to simultaneous actions. 'Enquanto estudas, eu cozinho' (While you study, I cook). 'Desde que' would not fit here unless you were setting a condition for the cooking to happen.

In some regional dialects, especially in rural Portugal or Brazil, you might hear desde que replaced by even more informal structures like 'só se' (only if). 'Só se tu fores' (Only if you go). While this conveys a similar meaning, it lacks the 'provided that' nuance of desde que. Understanding these variations allows you to adjust your register depending on who you are talking to. If you are writing an essay, stick to 'desde que' or 'contanto que'. If you are chatting with friends at a barbecue, 'se' or 'só se' might be more appropriate. This flexibility is what makes a language learner truly fluent.

Caso

Another conditional word meaning 'in case'. Requires subjunctive. Example: 'Caso precises de ajuda, liga-me.'