Based on the method of multimodal conversation analysis, this study focuses on turn-initial Sa, a Japanese interjection, and examines the role it plays in ongoing activities. We examined the development of the activities revealed through the participants’ speech and body movements, the timing at which Sa is produced in relation to the progress of the activities, and the subsequent actions and forms following the use of Sa. Unlike many previous studies that have investigated how turn-initial interjections indicate the relationship between sequences and turns in conversation, this study analyzed a variety of settings including not only speech-centered but also body-centered activities. The analysis showed that in multi-step activities, Sa at the boundary of activities can draw the recipients’ attention and highlight the speaker’s interest and attention to the next development of the activity. Doing so can also elicit others’ attention and participation. The analysis further revealed that, in both institutional and everyday situations, Sa is used by the person in charge of facilitating the activity or a participant imitating the person in charge. This indicates that Sa is a linguistic element that is institutionally and contextually linked to the responsibility and right to facilitate an activity.
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