Adverbs give information about verbs, adjectives, other adverbs, or entire sentences. Adverbs of manner tell how something is done. Most adverbs of manner are formed by adding –ment to the feminine form of the adjective. Adverbs of manner
If the masculine singular form of an adjective ends in a vowel, you add –ment to form the adverb.
If the masculine singular form of an adjective ends in –ant or –ent, -ant is replaced by -ament and -ent is replaced by –emment.
Some adjectives form adverbs by adding -ément to the masculine form. Adjectives ending in –e drop the –e before –ément is added.
A number of adjectives can be used as adverbs, mostly in set phrases. The masculine singular form of the adjective is used.
Usually they follow directly the verbs In compound tenses, short adverbs usually follow the auxiliary verb, and longer adverbs usually follow the past participle. When an adverb modifies and adjective or another adverb, it precede the verbs it modifies: Adverbs of manner ending in –ment can be replaced by avec plus the corresponding noun. The use & position of adverbs of manner
Sans + noun is often the equivalent of English adverbs ending in –lessly or English adverbs formed from negative adjectives. D’une façon, d’une manière, d’un ton, or d’un air plus an adjective may be used in place of an adverb when no adverb exists.