 One of the assumptions behind this cross-categorial analysis is that the input to the semantic component of grammar involves the units as coordinated at “surface structure” (i.e., no syntactic conjunction reduction, mapping non-sentential coordination to sentential coordination at “deep structure”). This is crucial for example to capture example (23b) where non-sentential disjunction could not be syntactically reduced to sentential disjunction without change of meaning. Rooth and Partee (1982) however discussed a number of counterexamples to such an analysis involving cases of wide-scope or in opaque contexts. Their famous example is repeated below (Rooth and Partee 1982: example (13)):