This presentation aims to propose a unified analysis for four elliptical constructions in Japanese: sluicing, ka(dooka)-stripping, to-stripping and fragments. These constructions are similar in that they can contain an immobile element as their remnant. On the other hand, they pattern differently with respect to island sensitivity; sluicing and ka(dooka)/to-stripping show island sensitivity, while fragments do not. I show that this pattern parallels their focus interpretation; sluicing and ka(dooka)/to-stripping are interpreted as exhaustive, while fragments are not. Based on these observations and the previous analyses of wh-in-situ in Japanese, I argue that sluicing and ka(dooka)/to-stripping involve null operator movement (Watanabe 1992) which is triggered by exhaustivity.
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