French adverbs, like their English counterparts, are used to modify adjectives, other adverbs, and verbs or clauses. They do not display any inflection; that is, their form does not change to reflect their precise role, nor any characteristics of what they modify.

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Formation

In French, as in English, most adverbs are derived from adjectives. In most cases, this is done by adding the suffix -ment ("-ly") to the adjective's feminine singular form. For example, the feminine singular form of lent ("slow") is lente, so the corresponding adverb is lentement ("slowly"); similarly, heureux → heureusement ("happy" → "happily").

As in English, however, the adjective stem is sometimes modified to accommodate the suffix:

• If the adjective ends in an i, then -ment is added to the masculine singular (default) form, rather than to the feminine singular form:
  • vrai → vraiment ("real" → "really")
  • poli → poliment ("polite" → "politely")
• If the adjective ends in -ant or -ent, then the corresponding adverb ends in -amment or -emment, respectively:
  • constant → constamment ("constant" → "constantly")
  • récent → récemment ("recent" → "recently")
• Some adjectives make other changes:
  • précis → précisément ("precise" → "precisely")
  • gentil → gentiment ("nice" → "nicely")

Some adverbs are derived from adjectives in completely irregular fashions, not even using the suffix -ment:

• bon → bien ("good" → "well")
• mauvais → mal ("bad" → "badly")
• meilleur → mieux ("better"-adjective → "better"-adverb)
• pire → pire ("worse"-adjective → "worse"-adverb)

And, as in English, many common adverbs are not derived from adjectives at all:

• ainsi ("thus" or "thusly")

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Placement

The placement of French adverbs is almost the same as the placement of English adverbs.

An adverb that modifies an adjective or adverb comes before that adjective or adverb:

• 'complètement''' vrai'' ("'''completely''' true")
• ''pas possible ("not possible")
• '''tellement''' discrètement'' ("'''so''' discreetly")

An adverb that modifies an [[French/Grammar/Tenses/Infinitive|Infinitive]] (verbal noun) generally comes after the infinitive: * ''marcher '''lentement''' ("to walk slowly") But negative adverbs, such as pas ("not"), plus ("not any more"), and jamais come before the infinitive:

• ne pas marcher ("not to walk")

An adverb that modifies a main verb or clause comes either after the verb, or before the clause:

• '''Lentement''' il commença à marcher'' or ''Il commença '''lentement''' à marcher'' ("Slowly, he began to walk" or "He began slowly to walk").

Note that, unlike in English, this is true even of negative adverbs: * ''Jamais je n'ai fait cela or Je n'ai jamais fait cela ("Never have I done that" or "I've never done that")

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List of common adverbs

• après
• afterwards
• :On va au cinéma après
• ::We'll go the cinema afterwards''
• also a preposition