The presumptive looks intimidating until you see its skeleton: a future-derived auxiliary + the invariable particle fi + a non-finite verb (gerund for present, participle for past). Once you notice that the auxiliary is simply the reduced future series (oi, ăi, o, om, ăți, or) recycled, the whole mood clicks into place — it is built from parts you already know. This page lays out the complete paradigm and shows exactly how the presumptive sits structurally between the future and the conditional.
The building blocks
Every presumptive form has three slots:
- Auxiliary — carries person and number (this is the only part that inflects).
- fi — the invariable infinitive of a fi ("to be"); it never changes.
- Non-finite verb — the gerund (-ând/-ind: mergând, plouând, citind) for present meaning, or the past participle (mers, plecat, citit) for past meaning.
So: o (aux) + fi + mergând (gerund) = o fi mergând ("he must be going"); o (aux) + fi + mers (participle) = o fi mers ("he must have gone").
The auxiliary: the reduced future series
The presumptive auxiliary is the short / colloquial future series — the same forms used in the popular spoken future (oi merge "I'll go"). Knowing this series is the whole game.
| Person | Reduced auxiliary | Full (literary) auxiliary |
|---|---|---|
| eu | oi | voi |
| tu | ăi / ei / îi | vei |
| el / ea | o | va |
| noi | om | vom |
| voi | ăți / eți | veți |
| ei / ele | or | vor |
In real life the third person singular o dominates the presumptive so heavily that o fi has become almost a fixed epistemic particle. The other persons exist and are used, but o fi is by far the most frequent. The full series (voi fi mergând, etc.) is more literary or emphatic; the reduced series (oi fi, o fi, or fi) is the spoken norm.
Present presumptive paradigm: a merge (to go)
Auxiliary + fi + gerund (mergând). Meaning: "must / might be going."
| Person | Reduced (spoken) | Full (literary) |
|---|---|---|
| eu | oi fi mergând | voi fi mergând |
| tu | ăi fi mergând | vei fi mergând |
| el / ea | o fi mergând | va fi mergând |
| noi | om fi mergând | vom fi mergând |
| voi | ăți fi mergând | veți fi mergând |
| ei / ele | or fi mergând | vor fi mergând |
O fi mergând pe jos, de asta întârzie.
He must be walking, that's why he's late.
Ce or fi gândind oamenii ăștia?
What can these people be thinking?
Past presumptive paradigm: a merge (to go)
Auxiliary + fi + past participle (mers). Meaning: "must / might have gone." This is the workhorse form of the mood.
| Person | Reduced (spoken) | Full (literary) |
|---|---|---|
| eu | oi fi mers | voi fi mers |
| tu | ăi fi mers | vei fi mers |
| el / ea | o fi mers | va fi mers |
| noi | om fi mers | vom fi mers |
| voi | ăți fi mers | veți fi mers |
| ei / ele | or fi mers | vor fi mers |
Oi fi greșit eu undeva, dar nu-mi dau seama unde.
I must have made a mistake somewhere, but I can't figure out where.
Or fi plecat deja, casa e pe întuneric.
They must have left already, the house is dark.
Va fi fost o neînțelegere la mijloc.
There must have been a misunderstanding involved. (literary register)
The aș fi + gerund variant: tentative supposition
Alongside the future-based forms, Romanian has a conditional-based presumptive: the conditional auxiliary (aș, ai, ar, am, ați, ar) + fi + gerund/participle. This adds a softer, more tentative "I would suppose / it would seem" colour, and it is the construction that makes the presumptive feel like a bridge between future and conditional.
| Person | Conditional-based present |
|---|---|
| eu | aș fi mergând |
| tu | ai fi mergând |
| el / ea | ar fi mergând |
| noi | am fi mergând |
| voi | ați fi mergând |
| ei / ele | ar fi mergând |
Ar fi știind el ceva ce noi nu știm.
He would seem to know something we don't. (cautious supposition)
Aș fi uitat ceva? Parcă lipsește ceva de pe listă.
Could I have forgotten something? Something seems to be missing from the list.
In practice the ar fi + gerund form is bookish and rarer than o fi; it's worth recognizing in reading, but in speech o fi covers most of this ground.
Where the presumptive sits: between future and conditional
This is the structural insight. Look at the three moods side by side and the family resemblance is unmistakable — they all combine an auxiliary with non-finite material:
| Mood | Auxiliary | Structure | Example |
|---|---|---|---|
| Future (full) | voi, vei, va… | aux + infinitive | va merge ("he will go") |
| Future (popular) | oi, ăi, o… | aux + infinitive | o merge ("he'll go") |
| Presumptive | oi, o, or… (or voi…) | aux + fi + gerund/participle | o fi mergând ("he must be going") |
| Conditional | aș, ai, ar… | aux + infinitive | ar merge ("he would go") |
The presumptive recycles the future auxiliary, then inserts the invariable fi and switches the lexical verb to a gerund or participle. That extra fi + non-finite verb is exactly what distinguishes o fi mergând (presumptive: "must be going") from o merge (future: "will go"). Once you see that the only structural difference from the future is the inserted fi and the non-finite ending, the formation stops feeling arbitrary.
Telling it apart from the future and the conditional
O să meargă la școală mâine.
He will go to school tomorrow. (future — o să + subjunctive)
O fi mergând la școală chiar acum.
He must be going to school right now. (presumptive — o fi + gerund)
Ar merge la școală dacă n-ar fi bolnav.
He would go to school if he weren't sick. (conditional — ar + infinitive)
The litmus test: fi + gerund/participle = presumptive. If you see o followed directly by an infinitive (o merge) or o să + subjunctive (o să meargă), it's the future. If you see ar + a bare infinitive (ar merge), it's the conditional. The presumptive always wedges fi in and ends in -ând/-ind or a participle.
Common Mistakes
❌ O mergând la birou.
Incorrect — the presumptive needs fi between the auxiliary and the gerund.
✅ O fi mergând la birou.
He must be going to the office.
❌ O fi merge la birou.
Incorrect — after fi you need a gerund or participle, not the bare infinitive (that pattern, o merge, is the future).
✅ O fi mergând la birou.
He must be going to the office.
❌ O să fi plecat (meaning 'he must have left').
Incorrect — o să + subjunctive is the future; for past inference drop să: o fi plecat.
✅ O fi plecat.
He must have left.
❌ Ar fi merge ceva în neregulă.
Incorrect — the conditional-based presumptive also needs fi + gerund/participle, not a finite verb.
✅ Ar fi mergând ceva în neregulă. / O fi ceva în neregulă.
Something must be going wrong. / Something must be wrong.
❌ Oi merge eu acolo (meaning 'I must have gone there').
Incorrect — that's the popular future ('I'll go'); for past inference insert fi: oi fi mers.
✅ Oi fi mers eu acolo, nu mai țin minte.
I must have gone there, I don't remember anymore.
Key Takeaways
- Presumptive = future-derived auxiliary (oi, ăi, o, om, ăți, or — or full voi, vei, va…) + invariable fi
- gerund (present) or participle (past).
- The auxiliary is the only inflecting part: eu oi fi, tu ăi fi, el o fi, noi om fi, voi ăți fi, ei or fi.
- A conditional-based variant (aș fi mergând) gives a softer, more tentative supposition; it is largely literary.
- The mood sits between future and conditional: same auxiliary as the future, plus an inserted fi and a non-finite verb. That inserted fi
- -ând/participle is what tells it apart.
- In real use, focus on o fi
- gerund/participle (3sg) and or fi (3pl); they account for the vast majority of presumptives you'll hear.
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Start learning Romanian→Related Topics
- The Presumptive Mood: OverviewC1 — An introduction to the Romanian prezumtiv — the mood of supposition, probability, and hearsay (must be, might be, supposedly is) built on o fi.
- The Colloquial Future (o să + conjunctiv)A2 — How to form and use the everyday spoken future with invariable 'o' plus 'să' and the conjunctive — the default future of conversational Romanian.
- The Literary Future (voi + infinitive)B1 — How to form Romanian's formal future — the auxiliary voi/vei/va/vom/veți/vor plus the bare short infinitive — where it belongs (news, literature, officialdom), and how clitics attach to it.
- Present Conditional: FormationB1 — How to build the present conditional across all four verb classes — the auxiliary aș/ai/ar/am/ați/ar plus the bare short infinitive — including a fi and a avea, and where clitic pronouns attach.
- The Gerunziu: FormationB1 — How to form the Romanian gerund with -ând or -ind, why the choice is phonologically predictable, and why it is never the English be + -ing progressive.