... Chinese-only principle, English was regularly and strategically employed as an international lingua franca (English as a lingua franca, ELF) for explanatory, managerial and interactive functions. ... CFL teaching and learning across three functions, namely, explanatory, managerial and interactive, can be useful. 11 aspects of their language and culture, and the information available ... Chinese, and between the students and native Chinese teachers. In fact, as early as the first CFL program which was conducted in China in 1950, the CFL teacher used English as a lingua franca...