couramment, avec aisance
He speaks English as fluently as any student in his class.
Il parle anglais aussi couramment que n'importe quel élève de sa classe.
Her dream was to be able to speak French fluently.
Son rêve était de pouvoir parler français couramment.
If only I could already speak German fluently!
Si seulement je pouvais déjà parler allemand couramment !
She can speak French, and fluently at that.
Elle parle français, et couramment de surcroît.
I heard her speaking English as fluently as an American.
Je l’ai entendue parler anglais aussi couramment qu’une Américaine.
How many languages can you speak fluently?
Combien de langues parlez-vous couramment ?