This paper reports the analysis of a stretch of classroom discourse using a Conversation Analysis (CA) approach to uncover the nature of how participants produce and respond to a particular question type - yes/no interrogatives (YNI) - within a student-led presentation. In this speech event, the analysis reveals how YNI, as proposed by Raymond (2003), produce constraints as well as expectations on the answers they structure. Using the basic CA unit of analysis, the turn-taking structure (where first pair parts make conditionally relevant elements within second pair parts), the data reveal that when non-type conforming responses are produced they are done so for cause - generally as a signal of some type of troublesome condition set by the YNI formation. In addition, non-type conforming responses are fashioned so as to provide accounts. Data support Raymonds view of type-conformity set by YNI as shown within a classroom speech event