The superlative (le plus, le moins)
The comparative with a definite article in front of it. That is the whole rule.
| plus grand que | bigger than (comparative, week 14) |
|---|---|
| le plus grand | the biggest (superlative) |
The article agrees with the noun, not with the adjective:
- C'est le plus grand bureau de la ville.
- C'est la plus petite pièce.
- Ce sont les plus longs formulaires.
*The group takes de, where English uses "in" or "of": "C'est le guichet le plus rapide de la mairie." — the busiest counter in the town hall. Never dans*.
Word order follows the adjective. French adjectives that come after the noun keep that position, and the article is repeated:
| adjective before the noun | le plus petit bureau |
|---|---|
| adjective after the noun | le dossier le plus important |
So le document le plus utile, with le twice — that repetition is the mark of the superlative and the thing most often left out.
The same two irregulars as the comparative:
| bon → le meilleur | C'est le meilleur moment pour y aller. |
|---|---|
| bien → le mieux | C'est le bureau qui répond le mieux. |
With an adverb the article is always le, because an adverb has no gender: C'est elle qui parle le plus vite.
Knowing the rule is not the same as producing it.
This page explains the pattern. The track drills it: the point arrives inside a mini-dialogue, then production marked against a CEFR descriptor, then a module test that returns you to your two weakest sessions if you miss it.