Forming adverbs from adjectives ending in -ant and -ent

Look at these adverbs:

Ce fil est apparent, mais apparemment personne ne l'a remarqué.This thread is showing, but apparently no one noticed it.

Notre amitié est récente : nous nous sommes rencontrés récemment.Our friendship is recent: we met recently.

Cette réponse est évidente : c'est évidemment 1515. This answer is obvious: it's obviously 1515.

Ce train est fréquent : il vient fréquemment. This train is frequent: it comes frequently.

Marc est très patient : il attend patiemment.Marc is very patient: he's waiting patiently.

When turned into adverbs, adjectives ending in -ant and -ent act as follows:

-ant becomes -amment 
-ent becomes -emment 
Pronunciation: -emment and -amment both pronounce the same = [aman]

 Attention:

Elle parle français couramment.She speaks French fluently.

Note that though the adverb couramment (fluently) is based on the adjective courant, the latter never means fluent, but can mean running (water), or common (word...).
Thus in French, you cannot express the sentence I am fluent in [...], but you use I speak [...] fluently instead.

 

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Examples and resources

Cette réponse est évidente : c'est évidemment 1515. This answer is obvious: it's obviously 1515.
Elle parle français couramment.She speaks French fluently.
Ce langage est courant: des millions de personnes le parlent couramment à travers le monde.This language is common: millions of people speak it fluently around the world.
Marc est très patient : il attend patiemment.Marc is very patient: he's waiting patiently.
Ce fil est apparent, mais apparemment personne ne l'a remarqué.This thread is showing, but apparently no one noticed it.
Notre amitié est récente : nous nous sommes rencontrés récemment.Our friendship is recent: we met recently.
Le temps n'est pas constant: il change constamment.The weather is not constant: it changes constantly.
Ce train est fréquent : il vient fréquemment. This train is frequent: it comes frequently.
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