The Supine as a Noun (la cules, mersul pe jos)

The supin is the non-finite form that has no clean English equivalent: it looks exactly like the past participle (mâncat, cules, făcut, mers) but it behaves like a noun-in-waiting — invariable, governed by a preposition, naming an action as a thing. This page gathers the supine's nominal and prepositional life into one map: the de + supine "to-be-Xed" frame, the tool frame (mașină de spălat), the la + supine activity frame (la cules), the aspectual a termina / a avea de + supine (am terminat de mâncat), and the fully nominalized, articulated activity noun (mersul pe jos, fumatul, cititul). Where the supine's grammar is laid out from scratch, this page treats it specifically as a noun-making machine and draws the lines that keep it apart from the long infinitive and the participle-adjective.

Why the supine matters: a verb form that thinks like a noun

English has no single word for "an action regarded as available, pending, or as an abstract activity." It improvises — "something to eat," "hard to believe," "the walking," "for washing." Romanian wraps all of that into the supine, a form that is shaped like the participle but functions across the noun's territory: as the object of a preposition (de cules, la cules), and, once articulated, as a free-standing noun (culesul). The whole system runs on one frozen form.

De + supine: "something to be Xed"

The flagship use. After a noun or an indefinite (ceva, nimic, mult, o grămadă), de + supine means "X to do / X to be done." It is everyday, ubiquitous Romanian.

In the evaluative version (greu de crezut, ușor de spus), the supine stays invariable even when the subject is feminine or plural — o poveste greu de crezut ("a story hard to believe"), not *greu de crezută. The full to-be-done and evaluative treatment is on the supine page; the point to carry here is that de + supine is the nominal complement slot — it fills the place a noun would fill ("want something / nothing / a story").

The tool frame: mașină de spălat

A productive sub-pattern names what a device or implement is for. De + supine after a concrete noun = "for -ing." This is how Romanian coins the names of appliances and tools, and once you know the supine you can decode — even invent — them.

These are lexicalized noun phrases, but they are built on the same supine pattern — the supine is doing nominal, classifying work ("the washing kind of machine").

La + supine: naming an activity

After verbs of motion (a merge, a se duce, a pleca) — and increasingly as a bare activity label — la + supine names an activity you set out to do. English uses "go -ing": la cules ("(at/to) the picking, harvesting"), la scăldat ("(to/at) bathing, swimming"), la pescuit ("fishing").

The preposition here is la, not de — la points to the activity as a destination or occupation ("off to the picking"). Note that some of these (culesul, scăldatul) also exist as fully articulated nouns; la cules is the prepositional activity frame, culesul is the bare noun (see below).

The aspectual frame: a termina / a avea de + supine

This is the construction most worth adding to your active range, because it is the supine doing aspectual work. A termina de + supine = "to finish -ing"; a avea de + supine = "to have (something) to do / left to do." Both are everyday and have no tidy infinitive or să substitute.

Notice the logic: a termina de mâncat literally frames it as "finish off the eating" — the supine names the activity being completed. And am de făcut ("I have to-be-done") expresses pending work as a quantity you possess. This a avea de idiom shades into modality ("things I must do"); for that periphrastic angle see a avea de.

The articulated supine: a full activity noun

Take the supine, add the definite article -ul, and it becomes a complete abstract noun naming the activity itself — like English "-ing" nouns ("smoking is bad"). This is the supine at its most noun-like: it heads a phrase, can be a subject, and is fully nominal.

These articulated supines are the everyday way to name an activity-as-subject. Fumatul, cititul, mersul, înotatul are listed in dictionaries as nouns in their own right. The fuller treatment of how the determiner triggers this conversion is on participles and supines as nouns; here the point is that the supine is the form being articulated, not the participle-adjective and not the infinitive.

The boundary: supine noun vs long infinitive vs participle

This is where learners slip, because Romanian has three verb-derived noun-ish forms that can all gloss as English "-ing":

Three tests sort them: (1) the participle-adjective agrees and modifies a noun (o carte citită "a read book"); the supine and long infinitive don't agree. (2) Between the two non-agreeing nouns, the articulated supine (cititul) is the natural everyday activity word, while the long infinitive (citire) is the abstract/technical or lexicalized one — citirea legii ("the reading of the law") is formal, cititul is what you do for pleasure. (3) The supine after a preposition (de cules, la cules, de mâncat) is always the bare frozen form.

Common Mistakes

Key Takeaways

• The supine is the participle form used nominally — invariable, preposition-governing — driving several uniquely-Romanian constructions.
• De
  • supine = "to be Xed" (ceva de mâncat, greu de crezut); the tool frame names devices (mașină de spălat); la
    • supine names activities (la cules).
• The aspectual a termina de
  • supine ("finish -ing") and a avea de
    • supine ("have to do") are everyday and take the bare supine, never de a
      • infinitive.
• The articulated supine (fumatul, cititul, mersul pe jos) is the everyday activity noun — distinct from the formal/abstract long infinitive (citire) and from the agreeing participle-adjective (o carte citită).
• Invariability and the de / la preposition are the supine's signature; agreement marks the participle instead.