What an adverb is — and how it differs from an adjective
An adverb describes an action or quality; an adjective describes a noun. Adverbs never change form.
Let's start with the big idea. An adjective describes a noun (a person, place or thing): une voiture rapide (a fast car) — rapide (fast) tells us about the car. An adverb describes a verb, an adjective, or another adverb — most often a verb: elle conduit rapidement (she drives quickly) — rapidement (quickly) tells us how she drives.
A simple test: if the word answers how? when? where? how often? how much?, it is almost always an adverb.
| Question it answers | English example | French example |
|---|---|---|
| How? | quickly, well | rapidement (quickly), bien (well) |
| When? | today, often | aujourd'hui (today), souvent (often) |
| Where? | here, there | ici (here), là (there) |
| How much? | a lot, too much | beaucoup (a lot), trop (too much) |
The single most important difference for a beginner: adverbs NEVER agree. An adjective changes its ending to match the noun (petit / petite / petits / petites — small). An adverb has one fixed form that never changes, no matter what surrounds it.
| Changes for gender/number? | Example | |
|---|---|---|
| Adjective | Yes — agrees with the noun | Il est lent / Elle est lente (He/She is slow) |
| Adverb | No — one form forever | Il parle lentement / Elle parle lentement (He/She speaks slowly) |
Worked mini-example. Look at Marie est sérieuse et elle travaille sérieusement (Marie is serious and she works seriously). The first sérieuse is an adjective — it agrees with Marie (feminine). The second, sérieusement (seriously), is an adverb describing how she works — and it stays the same whether the person is male or female.
- Adjective → describes a noun and agrees with it (lent/lente).
- Adverb → describes a verb/adjective/adverb and never changes (lentement).
- Test: does the word answer how / when / where / how much? → adverb.
- English -ly ≈ French -ment (quickly = rapidement).