Proper vs. common, e.g. 'John', which normally occurs whithout a proclitic determiner in English, and 'boy', which normally occurs with some determiner: 'the boy', 'a boy', 'this boy'.
- Nida (1949), Pag. 166

This category in English is syntactically pertinent, but is indicated morphologically in many languages.
- Nida (1949), Pag. 166