Theory of Accumulated Linguistic Competence
This states that in any language classroom, the Teacher's Linguistic Competence [TLC] will rise or fall in inverse proportion to that of their Students [SLC], such that the total Accumulated Linguistic Competence [ALC] from which teacher and students can draw at any one time will always remain static.
You're Juan, aren't you?
Sorry, I no understand nothing.
You're engineer, Juan. Yes, no?
Yes, and you're supposed to be my teacher, aren't you?
You're coming tomorrow, aren't you, Juan?