 Here is an argument (adapted from Dretske 1977) that the variable values what Susan steals = ⟨steals the bike, Susan, t⟩ and what Susan does to the bike = ⟨steals the bike, Susan, t⟩ should be treated differently. Suppose that the store has water-tight security, so that, if Susan steals anything at all—be it the bike, the canoe, or what-have-you—she will be arrested. Then, consider the sentences 5 and 6 (read them with additional stress on the emphasized words):