Most English language lessons are usually pre-planned and progress in a fairly predictable manner, often following the IRF (i.e. teacher initiation–learner response–teacher follow-up) cycle. Sometimes, however, there may be moments that have not been pre-planned and give rise to spontaneous language use. what learners have to be able to handle when they use English outside the classroom. In such out-of-school situations, discourse is seldom scripted and is usually co-constructed (Gil 2002) by the interlocutors with conversational norms and language emerging as the interaction proceeds. Markee (2005: 212).