13.47 Note In similar questions containing or, there is an ambiguity, signalled by intonation, between interpretation as an ordinary yes-no question and as an alternative question (cf 11.20-21): Did you [play football] or [go for a WALK]? (1) Did you [play FOOTball] or [go for a WALK]? (2) Only in the latter case can the sentence be expanded into a coordination of two complete clauses: [Did you play FOOTball] or [did you go for a WALK]? (A Comprehensive Grammar of the English Language; R. Quirk) Would you be so kind as to tell me whether I have understood it correctly that if (1) is answered yes it means one went for a walk and if the answer is no it means one played football? Thanks.