Work already done
Grammars
- The article the marks a noun phrase as definite: that is, as referring to something which can be identified uniquely in the contextual or general knowledge shared by speaker and hearer. Such shared knowledge… (Greenbaum & Quirk, 1990)
EFL textbooks
- Martina is learning to play violin. Jennifer is learning to play chess. (Morris & Stanton, 1994)
Mason and Uzar - NLP & TEFL