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.