fluency
No sabía que Tom podía hablar francés con tanta fluidez.
I didn't know Tom could speak French so fluently.
Habla japonés con una fluidez increíble a pesar de haberlo aprendido solo.
He speaks Japanese with incredible fluency despite having learned it on his own.
Puedo hablar tres idiomas con bastante fluidez.
I can speak three languages quite fluently.
Ojalá pudiera hablar francés con mayor fluidez.
I wish I could speak French more fluently.
Tom no habla francés con tanta fluidez como Mary.
Tom doesn't speak French as fluently as Mary does.