Positionally sensitive grammar is an influential notion of grammar in Interactional Linguistics,but what exactly are the sensitive positions in talk-in-interaction?Previous studies are not explicit enough in clarifying its types and constituents.Building on previous studies,this study further explores and classifies the sensitive positions in talk-in-interaction into three main types:1)sequential positions,including TCU positions,turn positions and sequence positions;2)positions of bodily-visual resources,including positions compared to TCUs and turns,as well as positions compared to conversat...