 Although this objection has force, the argument can be sharpened by undertaking a more careful study of what forms of existential generalization are warranted on a sentence containing plural expressions (Boolos 1984: 447 [1998a: 70]; McKay 2006: ch. 2; Yi 2002: 7–15 and 2005: 469–472). For instance, we may ask whether the following can be inferred from  (18):