L'Article Indéfini: un, une, des

The French indefinite article — un, une, des — is what you reach for when you introduce a noun for the first time, when the listener has no prior reason to know which one you mean. J'ai un chien (I have a dog) presents the dog as new information, in contrast to J'ai le chien (I have the dog), which presupposes that we both know which dog. The mechanics look simple — three forms agreeing with gender and number — but two features will trip up English speakers from day one: French has a plural indefinite article (des), where English just uses a bare noun (books, friends), and after a negation the whole series collapses into a single form de, regardless of the original gender or number. This page covers the forms, the uses, the negation rule, and the small but important set of contexts where French actively avoids the indefinite article — most prominently with body parts, where English would happily say blue eyes but French insists on les yeux bleus.

The three forms

The indefinite article agrees with the noun in gender (singular) and is invariable for gender in the plural.

Notice that un and une never elide before a vowel — they keep their full form: un ami, une amie, un hôtel. The n of un is pronounced as a liaison consonant before a vowel-initial noun: un ami /œ̃.na.mi/.

The big surprise: French has a plural "a"

English does not have a plural indefinite article. We say a book in the singular but just books in the plural — a bare noun with nothing in front of it. French does not allow this. The plural of un livre is des livres — des is obligatory.

The English translations show the asymmetry: where English drops the article entirely, French keeps des. Translating I have friends as J'ai amis is one of the most reliable transfer errors English speakers make in their first year. The fix is to internalize des as the plural of un/une — not as an optional "some," but as the regular indefinite article.

When English does explicitly say some (with light stress, as in I bought some books), French still uses plain des — there is no separate emphatic form. If French wants to emphasize some (as opposed to all or none), it uses quelques (a few) or certains (certain ones).

The big rule: indefinite → de after negation

When the verb is negated with ne... pas, ne... plus, ne... jamais, ne... rien, or any of the standard negations, the indefinite article in front of a direct object collapses to de (or d' before a vowel). All three forms — un, une, des — go to the same de.

The logic, once you see it, is satisfying: un, une, des assert that at least one such thing exists in the relevant scope ("there is a/some X"). When you negate that assertion, you are saying that zero of them exist — and it makes no sense to count zero as masculine, feminine, or plural. De is the form French uses for "not even one of any kind."

The être exception

There is one important exception: after the verb être (to be), the indefinite article does not change to de. The reason is that être does not introduce a quantity; it identifies or classifies, so the negation rule does not apply.

If you wrote Ce n'est pas de problème, a French speaker would mark it as wrong. The rule of thumb: when the negation is about what something is (être), keep un/une/des. When it is about having, doing, or eating something, switch to de.

One more refinement: contrast keeps the article

When the negation is contrastive — denying one thing in order to assert another — the indefinite article often survives, because the assertion is still about quantity, not non-existence.

Here un is closer to the numeral "one" than to the indefinite article, and the contrast (one vs. three, car vs. apartment) keeps it alive. This is a subtle effect; for most everyday negations, the de rule is what you want.

Where French actively avoids the indefinite article

French has several contexts where English would use a/an or some but French prefers a different determiner — most often the definite article le/la/les. The most important of these is body parts.

Body parts: definite, not indefinite

When you describe somebody's permanent or characteristic body parts, French uses the definite article, not the indefinite — even though English uses a/an.

The construction is fixed: avoir + les/le/la + body part + adjective. Saying Elle a des yeux bleus is not flat-out wrong, but it sounds odd in everyday speech, like a translation; the natural French is les yeux bleus. The deeper logic is that we treat each person as having a definite, knowable set of body parts — your eyes, your hair — and the article reflects that.

When the body part is being identified or counted, the indefinite is fine: J'ai un genou cassé (I have a broken knee — out of two knees), Il y a un cheveu dans ma soupe (There's a hair in my soup). But for general description, switch to definite.

Profession: no article

When you state somebody's profession after être, French drops the article entirely — no un, no le.

The article comes back if you modify the profession with an adjective or a relative clause: C'est un bon médecin (He is a good doctor), C'est un médecin que j'admire (He is a doctor I admire). The bare construction is for the unmodified profession statement.

Quantities: de + bare noun

After expressions of quantity — beaucoup (much/many), peu (little), assez (enough), trop (too much), un kilo (a kilo), une bouteille (a bottle) — French uses de + bare noun, with no article at all.

A common error is beaucoup des amis — wrong. After a quantity word, you drop the article. (The exception is la plupart de — la plupart des gens, "most people" — where des is the contraction of de + les with a definite article kept.)

When des becomes de before an adjective (formal)

Here is a subtle point that distinguishes careful, formal French from everyday speech. When des directly precedes an adjective + noun, formal French changes des to de.

In everyday spoken French, most people say des beaux enfants, des petites mains. In writing and careful speech, de beaux enfants, de petites mains is the prescribed form. As a learner, you can produce either; just recognize both. The rule applies only when the adjective comes before the noun (as a small set of common adjectives do — beau, bon, grand, petit, jeune, vieux, joli, mauvais). When the adjective follows the noun (as most do), des stays unchanged: des livres intéressants (interesting books) — never de livres intéressants.

Indefinite vs. definite vs. partitive — quick orientation

Here is how the three article systems align around a single noun:

The partitive — du, de la, des in the sense of some of an uncountable substance — applies to mass nouns (du pain, de l'eau) and is covered on its own page. Des is ambiguous between indefinite plural ("some books" = one or more books) and partitive plural ("some apples" = an unspecified quantity of apples) — but the boundary rarely matters in practice, because both behave identically grammatically.

Common Mistakes

Key takeaways

The indefinite article in French has three forms — un, une, des — and the plural des is the form English speakers most often forget, because English drops the article in plurals altogether. After negation, the whole series collapses to de, except after être (where un/une/des survive). Body parts and unmodified professions reject the indefinite article entirely, and quantity expressions take de + bare noun without any article. Master these four patterns — plural des, negation de, body-part les, profession bare — and you have eliminated the most common indefinite-article errors English speakers make.