Future Subjunctive: Common in EP Clauses
The future subjunctive is used in EP for open future conditions (se clauses), temporal clauses, and relative clauses with future reference. It remains very much alive in everyday EP speech.
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European Portuguese Grammar Guide
Formed from the third person plural preterite (same stem as imperfect conjunctive) with endings: -r, -res, -r, -rmos, -rdes, -rem. For regular verbs this is identical to the personal infinitive.
| Person | Falar | Comer | Ser/Ir (foram→) |
|---|---|---|---|
| eu | falar | comer | for |
| tu | falares | comeres | fores |
| ele/ela/você | falar | comer | for |
| nós | falarmos | comermos | formos |
| vós | falardes | comerdes | fordes |
| eles/elas/vocês | falarem | comerem | forem |
Se fizeres isso, vais arrepender-te.
If you do that, you will regret it.
Se + future conjunctive for a real open future condition.
Quando chegares, liga-me.
When you arrive, call me.
Quando + future conjunctive for a future temporal clause.
Se + future conjunctive (se fizeres) expresses a real open future condition. Do not use se + present indicative for future conditions as in English.
Also used in relative clauses with indefinite antecedents: "Quem quiser participar, que se inscreva." (Whoever wants to participate should register.)
From a PortuStories Story
Se conseguirmos bilhetes, iremos ao concerto na Altice Arena.
If we manage to get tickets, we will go to the concert at Altice Arena.