Quando Puderes: Future Subjunctive

European Portuguese has a future subjunctive (futuro do conjuntivo) for things that may happen in the future. It follows quando, se, enquanto, logo que, assim que, sempre que, and also quem, o que and como.

To form it, take the eles form of the preterite, drop -ram and add -, -es, -, -mos, -em:

• tiveram → tiver, tiveres, tiver, tivermos, tiverem
• fizeram → fizer, puderam → puder, quiseram → quiser, souberam → souber, disseram → disser, trouxeram → trouxer
• haver → houver (always singular, like há)

For regular verbs it looks like the infinitive: falar → falar, falares, falar, falarmos, falarem.

Watch out: ser and ir both give for; ver gives vir (vires), while vir gives vier (vieres).

Quando puderes, telefona-me. (When you can, phone me.)