Propositions are posited to perform a variety of explanatory roles. One important role is being what is designated by a dedicated linguistic expression like a that-clause. In this paper, the case that propositions are needed for such a role is bolstered by defending that there are other expressions dedicated to designating propositions. In particular, it is shown that natural language has anaphors for propositions. Complement so and the response markers yes and no are argued to be such expressions.