In this exchange, code choice marks a clash in frame perception, particularly whether the boundaries of the present situation are to be understood in spatial or temporal terms. Whereas from the teacher's perspective, speaking French characterises the larger setting of this particular school (he invokes spatial brackets), from the student's point of view code choice counts as a marker of 'official  classroom activity' (he invokes temporal brackets). Interestingly, the student's persistence in using English (S2) underlines his refusal (note that the same refusal could have been voiced as ce n'est pas encore 9 heurs). |