It was too late; in the brisk idiom of his mother-tongue, he was "caught with the goods on."
It was to him a marvel that these people's mother-tongue was Slav.
The best native servants are those who can only speak their mother-tongue.
The truth is that everyone is entered according to his mother-tongue.
She could already speak French and Italian as fluently as her mother-tongue.
Well, then, she could both read and write fluently in the mother-tongue.
What, if we will think of it, could he know of his first mother-tongue!
Again he fell to musing aloud, changing from Mexican to his mother-tongue.
They speak two languages, Russian and a dialect which is practically their mother-tongue.
He even smiled a little at his adoption of his adversary's mother-tongue.