Déterminant + adjectif : la chaîne complète

Unité GR-41 · campagne 2 · le tableau des déterminants, maintenant avec un adjectif dans la chaîne.

The determiner tables (previous unit) assumed a bare noun. Real French inserts an adjective — before the noun for a small famous family (petit, grand, beau, nouveau, vieux, bon, joli…), after it for everything else — and the insertion bends three things: the determiner itself, the adjective's form, and the liaisons.

Adjective BEFORE the noun (masculine: petit avion, beau train)

Three effects to memorise:

1. des → de before a preposed plural adjective: des avions but de petits avions, de beaux avions, de bons amis.
2. The special vowel forms: beau → bel, nouveau → nouvel, vieux → vieil — only before a vowel-initial masculine noun (un bel avion, but un beau train and une belle école).
3. The adjective takes the liaison: petit‿avion [t], grand‿homme [t], grands‿avions [z] — the adjective's silent final consonant wakes up.

Adjective AFTER the noun (the default position)

Postposed adjectives keep des intact (des trains rapides), agree in writing always, and agree audibly only when the feminine adds a consonant sound (vert/verte, grand/grande, petit/petite) — rapide, rouge, jaune sound identical everywhere. That asymmetry is exactly what the next unit weaponises.

Going further

Why the rule exists. De before a preposed adjective is a survivor. Older French used plain de whenever an adjective came before the noun, in the singular too (de bon vin); modern French kept it chiefly for the plural, and in careful writing. Bel, nouvel, vieil are old forms kept for the same reason as cet: before a vowel they let the words link without a clash.

Minimal pairs. One change between the two sentences, and what it does:

The errors to watch.

From Russian and English. Russian and English both put the adjective before the noun by default (новый самолёт, a new plane), so both push French learners to prepose — and then to miss the de it triggers. Russian has no article to change, English only some; the des → de switch has no counterpart in either, so it has to be learnt as French mechanics.

The complete rule. Des → de before a preposed plural adjective, in writing; everyday speech keeps des (des petits avions) and is heard constantly. Compound nouns always keep des: des jeunes gens, des petits pois, des grands-parents, des petits-enfants. Bel, nouvel, vieil exist only in the masculine singular before a vowel sound; the plural is beaux, nouveaux, vieux, with the liaison [z].

What des means before it ever meets an adjective is on Qu'est-ce qu'un déterminant ? Le sens de chaque famille.

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