Introduction
Understanding conditional connectors is essential for expressing possibilities, requirements, and consequences in Portuguese. Two frequently confused connectors are Desde que and Contanto que. Both can introduce conditions and often require the subjunctive mood, but they have different nuances and common uses. This article explains when and how to use each one, with clear examples in Brazilian Portuguese and helpful usage notes.
- Overview: desde que vs contanto que
- Verb mood: when to use the subjunctive
- Nuances and shades of meaning
- Subjunctive vs Indicative: when to use each mood
- Position and punctuation
- Common verbs and expressions that appear with these connectors
- Examples contrasting both connectors
- Colloquial alternatives and regional notes
- Negative and restrictive contexts
- Common mistakes and tips
- Cultural and pragmatic notes
- Summary of quick rules
- Conclusion
Overview: desde que vs contanto que
Both Desde que and Contanto que can introduce conditional clauses that influence which verb mood is required. In many contexts they are interchangeable, but they carry different tones and typical meanings.
Desde que often emphasizes dependence or a requirement that must be met for a result to occur. It can also indicate time in other contexts, but when used as a connector of conditions it usually means as long as or provided that.
Contanto que is closer to provided that or only if, and it usually stresses a stricter or more formal conditional limitation. It often suggests a stipulation or a requirement that the speaker wants to emphasize.
Verb mood: when to use the subjunctive
Both connectors commonly require the subjunctive because they introduce conditions that are hypothetical, desired, or uncertain. For Brazilian Portuguese learners, the most common subjunctive used after these connectors is the present subjunctive (presente do subjuntivo).
Structure: Connector + present subjunctive for present/future conditions.
Examples of present subjunctive forms (regular verbs):
falar → que eu fale, que você fale, que ele fale
comer → que eu coma, que você coma, que ele coma
partir → que eu parta, que você parta, que ele parta
Typical pattern
Condition clause (connector + subjunctive) + main clause (future/potential or imperative).
Example with Desde que:
Desde que você estude, você vai passar no exame.
Example with Contanto que:
Contanto que você estude, você vai passar no exame.
Nuances and shades of meaning
Although both can often be used interchangeably, subtle differences matter.
Desde que: dependence and permissiveness
Desde que frequently implies that the main clause depends on the condition, and it can be less strict or more neutral. It can also be used to grant permission when paired with verbs like permitir or deixar.
Examples:
Desde que você me avise, tudo bem.
Literally: As long as you tell me, it’s fine. The tone is permissive.
Vou sair hoje à noite desde que eu termine o trabalho.
I will go out tonight as long as I finish the work. The result depends on the fulfillment of the condition.
Contanto que: stipulation and restriction
Contanto que often carries a stronger sense of stipulation or a restriction imposed by the speaker. Use it when you want to emphasize that a particular requirement must be met for the main clause to be valid.
Examples:
Você pode usar o carro, contanto que o tanque esteja cheio quando você voltar.
You can use the car provided that the tank is full when you return. Strong stipulation.
Contanto que ele cumpra o contrato, aceitaremos a proposta.
Provided that he fulfills the contract, we will accept the proposal.
Subjunctive vs Indicative: when to use each mood
Although subjunctive is common, there are cases where the indicative appears after these connectors. The choice depends on whether the condition is hypothetical/uncertain or factual/definite.
Use subjunctive when the condition is uncertain or hypothetical
When the speaker considers the condition as possible but not certain, use the subjunctive in the subordinate clause.
Examples:
Desde que você faça a lição, pode assistir TV.
Contanto que ela possa vir, começaremos a reunião.
Use indicative when the condition is factual or habitual
If the condition expresses a regular fact, habit, or something certain, the indicative may be used instead.
Examples:
Desde que ele estuda, ele dorme melhor.
As a habitual fact: Since he studies, he sleeps better.
Note that with contanto que, indicative is less common because this connector usually implies a specific requirement rather than a general habit.
Position and punctuation
These connectors can appear at the beginning or in the middle of a sentence. When the condition clause comes first, a comma often separates the clauses. When the condition comes after the main clause, a comma is typically not used unless needed for clarity.
Examples:
Contanto que você chegue cedo, garantimos os ingressos.
Garante os ingressos contanto que você chegue cedo.
Desde que me ligue antes, tudo bem.
Tudo bem desde que me ligue antes.
Common verbs and expressions that appear with these connectors
Some verbs typically used in main clauses with these connectors include permitir, aceitar, precisar, concordar, combinar, sair, começar, and others that express permission, requirement, consequence, or planning. These verbs often take the future or a modal meaning when paired with a condition.
Examples:
Eu permito, desde que você trate bem o equipamento.
Aceitaremos a proposta, contanto que vocês assinem o contrato hoje.
Imperative in the main clause
When the main clause is an imperative (a command or instruction), the condition can be presented with these connectors as a prerequisite.
Example with Desde que:
Leve as chaves, desde que feche a porta ao sair.
Take the keys, provided that you lock the door when you leave.
Example with Contanto que:
Assine aqui, contanto que você entenda os termos.
Sign here provided that you understand the terms.
Examples contrasting both connectors
Below are pairs of sentences where both connectors could be used, showing subtle differences in tone.
1) Permission to borrow something
Desde que você me prometa devolver, você pode pegar meu livro.
Contanto que você me prometa devolver, você pode pegar meu livro.
Notes: With desde que, tone is slightly more casual and permissive. With contanto que, tone stresses the condition as important.
2) Work condition
Podemos trabalhar remotamente desde que o projeto esteja dentro do prazo.
Podemos trabalhar remotamente contanto que o projeto esteja dentro do prazo.
Notes: Both are acceptable. Contanto que sounds a bit more formal or strict about the deadline.
3) Conditional offer
Vou ao cinema com você desde que você compre os ingressos.
Vou ao cinema com você contanto que você compre os ingressos.
Notes: Contanto que emphasizes the purchase as the non-negotiable condition.
Colloquial alternatives and regional notes
In spoken Brazilian Portuguese, other condition words like se, caso, desde que, and contanto que are used. Se and caso are very common and usually interchangeable with a conditional meaning, but they can lack the nuance of dependence or stipulation that desde que and contanto que provide.
Regional preference: Brazilian Portuguese speakers across regions recognize both connectors. In everyday speech, desde que may be used more casually, while contanto que can sound slightly more formal or emphatic.
Negative and restrictive contexts
Both connectors can appear in negative or restrictive contexts to block an action or to put a condition on refusal or acceptance.
Examples:
Não emprestarei meu carro desde que você não saiba dirigir bem.
I will not lend my car as long as you do not drive well.
Não haverá desconto, contanto que você chegue após o prazo de inscrição.
There will be no discount provided that you arrive after the registration deadline.
Common mistakes and tips
1) Using the wrong mood: Many learners default to the indicative. Remember to use the subjunctive when the condition is uncertain or hypothetical.
2) Confusing time and condition uses of desde que: Desde que can mean since or as long as in temporal contexts. Pay attention to context to avoid misinterpretation.
Example contrast:
Desde que ele chegou, a festa melhorou. (temporal: since he arrived)
Since the arrival, the party improved.
Desde que ele chegue, a festa vai começar. (conditional: as long as he arrives)
3) Tone differences: Choose contanto que when you need a firmer or more formal condition; choose desde que for more neutral or permissive tones.
Cultural and pragmatic notes
In Brazilian culture everyday conversations, politeness and clarity matter. Using contanto que can sound more assertive or legalistic, which is useful in formal agreements, workplace rules, or instructions. Desde que often appears in friendly or casual contexts when expressing a trade-off or permission among friends and family.
In contracts, legal texts, or formal proposals, writers often prefer contanto que or other formal connectors like caso or desde que acompanhado de cláusulas formais, to ensure clarity and enforceability.
Summary of quick rules
– Both Desde que and Contanto que can introduce conditions and commonly trigger the present subjunctive.
– Use the subjunctive when the condition is hypothetical, uncertain, or a required stipulation.
– Use indicative when the condition is factual or habitual.
– Desde que leans toward permissive or dependent meanings and can be more casual.
– Contanto que emphasizes a stricter stipulation, often more formal or emphatic.
Conclusion
Learning the difference between Desde que and Contanto que will make your Portuguese more precise and natural. Both introduce conditions and often require the subjunctive, but desde que is more permissive or neutral while contanto que stresses a strict requirement. Pay attention to context, verb mood, and tone to choose the best connector for each situation.
