what is truth ? what sorts of things can be true. Is truth a property of sentences or a property of propositions ? ; Theories of truth : Correspondence theory, the semantic theory, the deflationary theory, the coherence theory, the pragmatic theory. Can claims about the future be true now ? Can the predicate “is true” be completely defined in other terms or it can be eliminated without loss of meaning, from any context in which it occurs ? to what extent do theories of truth avoid paradox ? is the goal of scientific research to achieve truth ?