He fell into a deep sleep and was muttering in his sleep.

He is studying every day to learn the local language.

There are many polysemous words in Japanese.

Men's language refers to words and expressions mainly used by men.

He started learning Manchu language.

He likes to speak using conventional phrases.

She overcame speech production disorder after brain damage.

He has retained his ability to produce speech even after brain damage.

Derivative is one of the important concepts in linguistics.

He went to North Korea to learn the cultural language.