 Lewis recognizes this difficulty and proposes to deal with it by appealing to his counterpart theory (Lewis 1971, 1986, and 1993). Different concepts, e.g., statue and piece of clay are associated with different counterpart relations and hence with different criteria of trans-world identity. This has the effect of rendering modal predicates “Abelardian” (Noonan 1991, 1993). The property determined by a modal predicate may be affected by the subject term of a sentence containing the predicate. The subject term denotes an object belonging to this or that kind or sort. But different kinds or sorts may determine different properties (or different counterpart relations). In particular, the properties determined by the predicate ‘might not have coincided with \(c_2\)’ (where \(c_2\) names the day 2 stage of \(c)\) in the following sentences,