I don't understand German.
Father translated the German letter into Japanese.
She can speak French and German, not to speak of English.
She speaks German and French, not to mention English.
Not only does she speak English, but also German.
She can speak both English and German.
She can speak German, not to mention English.
She graduated in German at Cambridge.
They quarreled as to which was easier, French or German.
He speaks Japanese well, but I can't speak German.
He is studying English, but he is also studying German.
He can speak both English and German.
He can speak French and German, not to mention English.
He speaks German, not to mention English.
He speaks German, not to mention English.
He can speak not only English but also German.
He can speak German, not to mention English and French.
He speaks Spanish, not to mention English and German.
He speaks only English and German, neither of which I understand.
He cannot speak English, much less German.