I suspect they knew as much (or as little), for all conversational purposes, as any English girls do, who have never been abroad, and have only learnt the idioms and pronunciation from an Englishwoman.

The two sisters clung together, and kept apart from the herd of happy, boisterous, well-befriended Belgian girls, who, in their turn, thought the new English pupils wild and scared-looking, with strange, odd, insular ideas about dress; for Emily had taken a fancy to the fashion, ugly and preposterous even during its reign, of gigot sleves, and persisted in wearing them long after they were "gone out." Her petticoats, too, had not a curve or a wave in them, but hung down straight and long, clinging to her lank figure.

The sisters spoke to no one but from necessity.

They were too full of earnest thought, and of the exile's sick yearning, to be ready for careless conversation or merry game.

M.Heger, who had done little but observe, during the few first weeks of their residence in the Rue d'Isabelle, perceived that with their unusual characters, and extraordinary talents, a different mode must be adopted from that in which he generally taught French to English girls.