Futuro do Subjuntivo (Future Subjunctive)

The futuro do subjuntivo is used to express hypothetical or uncertain future actions that depend on a condition or are triggered by another future event.
It is especially common in conditional clauses and after certain conjunctions such as quando (when), se (if), and assim que (as soon as).

Mood

The subjunctive mood expresses possibility, doubt, or conditions rather than certainty.
The future tense in the subjunctive mood refers to actions that will occur if certain conditions are met or when a specific future time arrives.

• Subjunctive mood = possibility, uncertainty, conditions
• Future tense = events that might or will happen in the future

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Formation

Take the third-person plural (eles) form of the pretérito perfeito do indicativo, remove the final -am, and add the future subjunctive endings:

Person	AR Example (falar)	ER Example (comer)	IR Example (partir)
Eu (I)	falar	comer	partir
Tu (you, sg.)	falares	comeres	partires
Ele/Ela/Você	falar	comer	partir
Nós (we)	falarmos	comermos	partirmos
Vós (you, pl.)	falardes	comerdes	partirdes
Eles/Elas/Vocês	falarem	comerem	partirem

Note: The eu and ele/ela/você forms are identical and have no ending change.

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Usage

• Hypothetical future events:
  Se ele chegar cedo, iremos ao cinema.
  (If he arrives early, we will go to the movies.)
• Future conditions:
  Quando nós terminarmos, vamos celebrar.
  (When we finish, we will celebrate.)
• After certain conjunctions indicating time or condition:
  Assim que concluíres o trabalho, envia-me.
  (As soon as you finish the work, send it to me.)

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Irregular Verbs

The irregularity in this tense comes from irregular pretérito perfeito do indicativo stems.
Here are some common examples:

Verb	Pretérito Perfeito (eles)	Stem	Example (nós form)
estar	estiveram	estiver-	quando nós estivermos
ser / ir	foram	for-	quando nós formos
ter	tiveram	tiver-	quando nós tivermos
haver	houveram	houver-	quando nós houvermos
poder	puderam	puder-	quando nós pudermos
fazer	fizeram	fizer-	quando nós fizermos
dizer	disseram	disser-	quando nós dissermos

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Brazilian Portuguese Differences

• Structure & usage:
  The conjugation and usage are identical in BP and EP.
  However, pronunciation differences may occur in some forms.
• Formality:
  In both BP and EP, the futuro do subjuntivo is common in spoken and written language, especially after se and quando.
• Pronouns:
  • BP uses você instead of tu in most regions:
    • BP: Se você chegar cedo, vamos sair.
    • EP: Se tu chegares cedo, vamos sair.

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Common Time Expressions & Triggers

• Se (if)
• Quando (when)
• Assim que (as soon as)
• Logo que (as soon as)
• Depois que (after)

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Examples

• Quando ela terminar o curso, procurará emprego.
  (When she finishes the course, she will look for a job.)
• Se eu encontrar a chave, aviso-te.
  (If I find the key, I will let you know.)
• Logo que chegarmos, começaremos a reunião.
  (As soon as we arrive, we will start the meeting.)