Mastering the Future Subjunctive: The 'When & If' Tense
Grammar Rule in 30 Seconds
Use the Future Subjunctive to talk about hypothetical future events triggered by 'when' (quando) or 'if' (se).
- Use it after 'quando' to express a future event: 'Quando eu chegar, te ligo.'
- Use it after 'se' to express a condition: 'Se você quiser, podemos ir.'
- It is formed from the third-person plural preterite stem.
Overview
The Portuguese Future Subjunctive (Futuro do Subjuntivo) is essential for expressing uncertainty, conditionality, and hypothetical actions in the future. Unlike English, which often uses the simple present tense for future conditions (e.g., "When I arrive, I'll call you"), Portuguese distinguishes rigorously between factual future events and those contingent on a condition or yet to materialize. This tense marks a future event as non-factual or dependent, serving as the grammar of "when," "if," and "as soon as." Mastery of this tense enables precise articulation of complex future scenarios, vital for B2 learners.
It reflects the language's emphasis on mood and the speaker's perception of certainty.
How This Grammar Works
Quando eu chego, ligo-te.(Present Indicative): "Whenever I arrive, I call you" (habitual/certain).Quando eu chegar, ligo-te.(Future Subjunctive): "When I arrive (in the future, if/when that happens), I'll call you." The arrival is a future possibility, not a current fact. The mood reflects a speaker's subjectivity and perception of reality.
Formation Pattern
eles/elas/vocês) form of the Pretérito Perfeito Simples (Simple Past Tense).
-AR, -ER, and -IR verbs, the Future Subjunctive is identical to the Infinitive for all persons except nós, where the accent mark is typically dropped (though stress remains on the original last syllable of the stem).
falar (to speak) | comer (to eat) | partir (to leave) |
eu | falar | comer | partir |
tu | falares | comeres | partires |
ele/ela/você | falar | comer | partir |
nós | falarmos | comermos | partirmos |
vós | falardes | comerdes | partirdes |
eles/elas/vocês | falarem | comerem | partirem |
-R, -RES, -R, -RMOS, -RDES, -REM attached to the verb stem.
eles Pretérito Perfeito Method
eles/elas/vocês) form of the verb in the Pretérito Perfeito Simples.
fazer → eles fizeram (they did)
-am ending. This yields the irregular stem.
fizeram → fizer-
eu: (stem)
tu: (stem) + -es
ele/ela/você: (stem)
nós: (stem) + -mos
vós: (stem) + -des
eles/elas/vocês: (stem) + -em
eles | Stem | eu form (tu / nós) | Example Usage |
ser | foram | for- | for (fores / formos) | Quando eu for à praia... (When I go to the beach...) |
ir | foram | for- | for (fores / formos) | Se ele for, eu vou também. (If he goes, I'll go too.) |
ter | tiveram | tiver- | tiver (tiveres / tivermos) | Se tiveres tempo... (If you have time...) |
fazer | fizeram | fizer- | fizer (fizeres / fizermos) | Assim que fizermos o jantar... (As soon as we make dinner...) |
vir | vieram | vier- | vier (vieres / viermos) | Quando ele vier, avisem-me. (When he comes, let me know.) |
dizer | disseram | disser- | disser (disseres / dissermos) | Quem disser a verdade... (Whoever tells the truth...) |
saber | souberam | souber- | souber (souberes / soubermos) | Se souberem de algo... (If you know something...) |
poder | puderam | puder- | puder (puderes / pudermos) | Enquanto eu puder ajudar... (As long as I can help...) |
pôr | puseram | puser- | puser (puseres / pusermos) | Quando eu puser as malas... (When I put the bags...) |
eles Pretérito Perfeito method is the most reliable way to form irregular Future Subjunctives.
When To Use It
Quando(When): Implies the main clause's action occurs after the subordinate clause's action, and the timing is not a concrete fact.Quando chegarem as tuas férias, avisem-me.(When your holidays arrive, let me know.)Vamos viajar quando tivermos dinheiro.(We will travel when we have money.)Assim que / Logo que(As soon as): Emphasize immediacy once the condition is met.Assim que o chefe mandar o email, começo a trabalhar.(As soon as the boss sends the email, I'll start working.)Enquanto(While, as long as): Implies duration or a persistent condition.Enquanto eu estiver aqui, podes contar comigo.(As long as I am here, you can count on me.)Até que(Until): Denotes a time limit.Vou esperar até que ele volte.(I'll wait until he returns.)Depois que(After): Indicates sequence, similar toquando.Depois que você terminar o relatório, podemos discutir.(After you finish the report, we can discuss.)
Se - If-statements):se (if) to introduce a hypothesis or condition for the future. It denotes a realizable future condition.Se você precisar de ajuda, ligue para mim.(If you need help, call me.)Não haverá problema se eles trouxerem os documentos.(There won't be a problem if they bring the documents.)- Contrast:
Sewith Future Subjunctive is for a possible future event.Sewith Imperfect Subjunctive (se tivesse...) refers to hypothetical or unreal past/present conditions.
quem, o que, onde) refers to an unspecified person, thing, or place, and the action is future. Implies "whoever," "whatever," "wherever."Quem(Whoever):Quem quiser vir à festa, é bem-vindo.(Whoever wants to come to the party is welcome.)O que(Whatever):Faça o que achar melhor.(Do whatever you think is best.)Onde(Wherever):Vou onde você for.(I'll go wherever you go.)
Common Mistakes
- Mistake: Directly translating English future conditions like "When I go" using Portuguese Present Indicative.
- Why it's wrong: English uses present simple (
When I go), but Portuguese requires the Future Subjunctive for conditional future actions. Present Indicative (quando eu vou) makes it habitual or factual, not conditional. - Error:
Quando eu chego em casa, eu te ligo.(Incorrect: "Whenever I arrive home...") - Correction:
Quando eu chegar em casa, eu te ligo.(Correct: "When I arrive home (in the future), I'll call you.") - Rule: If "when" or "if" refers to an uncertain future event, use Future Subjunctive.
Ver (to see) vs. Vir (to come) Confusion:- Mistake: Swapping the Future Subjunctive forms of these two irregular verbs.
- Forms:
- Future Subjunctive of
ver(to see):eu vir,tu vires,ele vir. - Future Subjunctive of
vir(to come):eu vier,tu vieres,ele vier. - Why it's confusing: Similar infinitives lead to similar-looking but distinct subjunctive forms.
- Error:
Se eu vier a solução, eu digo-te.(Incorrect: implies "If I come the solution...") - Correction:
Se eu vir a solução, eu digo-te.(Correct: "If I see the solution, I'll tell you.") - Tip: Memorize these forms specifically; context is crucial for differentiation.
- Mistake: For regular verbs, some Future Subjunctive forms (
eu,ele/você, andnósforms) are identical to the Personal Infinitive, leading to misapplication. - Distinction:
- Future Subjunctive: Expresses uncertainty/conditionality, triggered by
quando,se. About a future event contingent on a condition. Quando eu falar com ele, aviso-te.(Future Subj.: When I speak with him (in the future), I'll let you know.)- Personal Infinitive: Indicates the subject of an action after prepositions (
para,por,antes de) or certain verbs. Focuses on purpose or agent. Para eu falar com ele, preciso do número.(Personal Inf.: For me to speak with him, I need the number.)- Rule: Context and the preceding word determine usage. Conjunctions for condition, prepositions for purpose.
- Mistake: Employing the Future Subjunctive when a future event is certain or a known fact.
- Why it's wrong: The Future Subjunctive signals uncertainty. For definite plans, use Present or Simple Future Indicative.
- Error:
Eu sei que quando ele chegar (incorrect), a festa começa.(His arrival is a known fact). - Correction:
Eu sei que quando ele chega (Present Indicative), a festa começa.(Correct: "I know that when he arrives, the party starts.") - Rule: Reserve Future Subjunctive for truly conditional or potential future events.
Nós form accent mark drop (BP nuance):- Mistake: Maintaining the accent mark on the
nósform in Brazilian Portuguese (e.g.,fizêrmos). - Detail: In BP, the accent mark typically disappears in the
nósform (e.g.,tivermos,falarmos), although stress remains on the original last syllable of the stem. EP might retain accents more often. - Rule: For the
nósform of Future Subjunctive in BP, generally remove the accent mark from the vowel preceding ther. Stressti-VER-mos, notti-ver-MOS.
Real Conversations
The Future Subjunctive is an indispensable part of everyday Portuguese, in both casual and formal contexts.
1. Everyday Planning & Coordination (WhatsApp/Texting):
- "Oi, quando chegares (EP) / chegar (BP) ao aeroporto, avisa, sim?" (Hey, when you arrive at the airport, let me know, ok?)
- "Se der (from dar, to be possible), a gente se encontra pra um café depois." (If it's possible, we'll meet for coffee later.) - Se der is a very common idiom.
- "Assim que eu terminar a reunião, eu ligo para você." (As soon as I finish the meeting, I'll call you.)
2. Expressing Conditions & Requirements (Work/Formal):
- "Por favor, revisa o documento e, se houver (from haver, there to be) alguma dúvida, envia um email." (Please review the document, and if there are any doubts, send an email.)
- "Enquanto vocês estiverem responsáveis, precisamos de relatórios semanais." (As long as you are responsible, we need weekly reports.)
- "A proposta será aprovada depois que recebermos todas as assinaturas." (The proposal will be approved after we receive all signatures.)
3. Speculation & Hypotheticals (Social Media/Discussions):
- "Quem for ao show, me diga se valeu a pena!" (Whoever goes to the concert, tell me if it was worth it!)
- "Se chover (from chover, to rain) amanhã, o jogo será cancelado." (If it rains tomorrow, the game will be canceled.)
4. Advice & Warnings:
- "Tenha cuidado quando entrares (EP) / entrar (BP) naquela rua." (Be careful when you enter that street.)
- "Se você for viajar, lembre-se de trancar a porta." (If you travel, remember to lock the door.)
Observe how native speakers use the Future Subjunctive to express nuanced future possibilities, making your own Portuguese sound more natural and sophisticated.
Quick FAQ
farei, irei)?No, not interchangeably. Using the Simple Future Indicative (Quando eu farei...) where the Future Subjunctive is required is grammatically incorrect. The Future Indicative expresses certainty (Eu farei), while the Future Subjunctive expresses contingency (Quando eu fizer). While understandable, it sounds unnatural.
Forms and usage are largely consistent. The main difference is the more frequent use of tu and vós forms in EP. In BP, você (using the ele/ela form) is typically used even informally, so Quando você for is more common than Quando tu fores. The vós form is rare in modern BP speech.
The Present Subjunctive is used for future actions when the trigger conveys a wish, doubt, emotion, or impersonal judgment, and the action is not explicitly conditional with quando or se. Example: Espero que ele venha amanhã. (I hope he comes tomorrow.) Here, venha is Present Subjunctive because espero que expresses a wish. The Future Subjunctive (Quando ele vier amanhã, falaremos.) is for conditional future events.
The Future Subjunctive deals with unrealized, hypothetical, or conditional future events.
- Simple Future Indicative (
farei): Definite future action/prediction.Eu farei o trabalho amanhã. - Periphrastic Future (
ir+ infinitive,vou fazer): Planned/imminent future action.Vou fazer o trabalho amanhã. - Present Indicative for Future (
faço): Scheduled events/strong intentions.Amanhã faço o trabalho.
caso instead of se?Yes, caso (in case) is a common alternative for conditional clauses and also typically requires the Future Subjunctive when referring to specific future events. Example: Caso ele precise de ajuda, eu estarei lá. (In case he needs help, I'll be there.) While some grammarians might allow Present Subjunctive with caso, using the Future Subjunctive for clarity on future conditions is a safe approach.
Future Subjunctive Conjugation (Regular -AR)
| Person | Verb: Falar |
|---|---|
|
Eu
|
falar
|
|
Tu
|
falares
|
|
Ele/Você
|
falar
|
|
Nós
|
falarmos
|
|
Vós
|
falardes
|
|
Eles/Vocês
|
falarem
|
Meanings
The Future Subjunctive is used to express a future action that is dependent on a condition or a specific point in time.
Conditional 'If'
Expressing a condition that must be met in the future.
“Se ele chegar cedo, vamos sair.”
“Se você me disser a verdade, eu te ajudo.”
Temporal 'When'
Referring to a future time when an action will occur.
“Quando eu for ao Brasil, te aviso.”
“Quando eles quiserem, podem entrar.”
Reference Table
| Form | Structure | Example |
|---|---|---|
|
Affirmative
|
Se + Subjunctive
|
Se eu for, vou.
|
|
Negative
|
Se + não + Subjunctive
|
Se não formos, não veremos.
|
|
Question
|
Quando + Subjunctive?
|
Quando você vier?
|
|
Short Answer
|
Subjunctive
|
Se eu puder.
|
|
Irregular
|
Stem + Ending
|
Se eu tiver.
|
|
Future Marker
|
Quando + Subjunctive
|
Quando eu fizer.
|
Formality Spectrum
Caso deseje, podemos ir. (Invitation)
Se você quiser, podemos ir. (Invitation)
Se quiser, a gente vai. (Invitation)
Se quiser, partiu. (Invitation)
Future Subjunctive Triggers
Time
- Quando When
- Assim que As soon as
Condition
- Se If
- Caso In case
Examples by Level
Se você puder, venha.
If you can, come.
Quando eu chegar, te ligo.
When I arrive, I'll call you.
Se eles quiserem, podemos ir.
If they want, we can go.
Assim que você tiver o resultado, me avise.
As soon as you have the result, let me know.
Caso o projeto não for aprovado, teremos que revisar.
In case the project is not approved, we will have to revise.
Se porventura vierem a discordar, buscaremos mediação.
Should they happen to disagree, we will seek mediation.
Easily Confused
They look identical for regular verbs.
Learners use present for future events.
Both are used in 'if' clauses.
Common Mistakes
Quando eu chego
Quando eu chegar
Se eu tenho
Se eu tiver
Quando ele vai
Quando ele for
Se você quer
Se você quiser
Quando nós fazemos
Quando nós fizermos
Se eles vêm
Se eles vierem
Quando eu vejo
Quando eu vir
Se eu faria
Se eu fizer
Quando eu teria
Quando eu tiver
Se ele pusesse
Se ele puser
Se ele for ter
Se ele tiver
Quando for a ser
Quando for
Se eles forem a querer
Se eles quiserem
Sentence Patterns
Quando eu ___ , te ligo.
Se você ___ , eu vou.
Assim que ele ___ , começamos.
Caso você ___ , me avise.
Real World Usage
Quando chegar, avisa!
Assim que tivermos os dados, enviaremos.
Se eu encontrar um voo barato, compro.
Se o pedido não chegar, ligue.
Se eu for contratado, darei o meu melhor.
Quando eu for, posto fotos!
Focus on the stem
Don't use the future
Listen for the -em
Regional differences
Smart Tips
Always use the subjunctive.
Use the subjunctive, not the present.
Check the preterite form first.
Use 'Caso' + subjunctive.
Pronunciation
Stress
The stress usually falls on the penultimate syllable.
Conditional rise
Se você vier, ↗ subimos.
The rising intonation on the condition clause.
Memorize It
Mnemonic
Think of the 'Future Subjunctive' as the 'Maybe' tense. If it hasn't happened yet, it's a 'Maybe'!
Visual Association
Imagine a fork in the road. One path is labeled 'Se' (If) and the other 'Quando' (When). Both lead to a future destination that is currently just a dream.
Rhyme
When the future is uncertain and you want to be clear, use the subjunctive to make it appear.
Story
Maria is planning a trip. She says: 'Se eu tiver dinheiro, vou viajar. Quando eu chegar lá, vou comer muito. Se eu gostar, vou ficar.' She uses the subjunctive for every step of her future plan.
Word Web
Challenge
Write 5 sentences about your plans for next weekend using 'Quando' and 'Se'.
Cultural Notes
Very common in daily speech. Brazilians often use 'a gente' + verb.
More formal usage, often preferred in writing.
Similar to European Portuguese, formal and precise.
Derived from the Latin future perfect indicative.
Conversation Starters
O que você vai fazer quando chegar em casa?
Se você pudesse viajar amanhã, para onde iria?
Quando você terminar o curso, o que pretende fazer?
Se o mundo mudar, como você acha que será?
Journal Prompts
Common Mistakes
Test Yourself
Quando eu ___ o trabalho, te aviso.
Which is correct?
Find and fix the mistake:
Quando ele chegará, me avisa.
Se você quer, podemos ir.
Se nós ___ tempo...
Match each item on the left with its pair on the right:
A: Quando você ___? B: Amanhã.
Se / você / poder / vir.
Score: /8
Practice Exercises
8 exercisesQuando eu ___ o trabalho, te aviso.
Which is correct?
Find and fix the mistake:
Quando ele chegará, me avisa.
Se você quer, podemos ir.
Se nós ___ tempo...
Falar -> Falar, Fazer -> ?
A: Quando você ___? B: Amanhã.
Se / você / poder / vir.
Score: /8
Practice Bank
12 exercisesSe nós ___ (ir) ao cinema, eu pago a pipoca.
Quando vocês ___ (fazer) o dever de casa, podem jogar.
When I arrive, I will sleep.
Se tu estares livre amanhã, vamos sair.
Match the stems
quiser / Se / você / pode / ficar
Quando você ___ a mesa, me chame.
Which sentence implies uncertainty?
Enquanto eu ser o chefe, mando eu.
Se eles ___ bebida, a festa melhora.
If I can...
Logo que nós ___ (sair), avisamos.
Score: /12
FAQ (8)
Yes, it is extremely common in Brazil and standard in Portugal.
Only if you are talking about a habit, not a future event.
'Fizer' is future, 'fizesse' is imperfect (hypothetical).
Most follow the pattern of the preterite stem.
No, 'porque' usually takes the indicative.
Yes, it is essential for formal and legal documents.
You will sound like a beginner and may be misunderstood.
No, they are completely different tenses.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Futuro de subjuntivo
Frequency of use.
Futur simple
French does not use the subjunctive here.
Wenn-Satz
German lacks a future subjunctive mood.
Conditional 'tara'
Japanese is agglutinative, not inflectional.
Idha + verb
Arabic uses indicative or jussive.
Yao + verb
Chinese has no verb conjugation.
Learning Path
Prerequisites
Learn These First
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