 Thus, contextualists seek to explain how the Liar sentence can have unstable semantic status, switching from defective to non-defective in the course of this sort of inference. They do so by appealing to the role of context in fixing the semantic status of sentences. Sentences can have different semantic status in different contexts. Thus, to contextualists, there must be some non-trivial effect of context involved in the Liar sentence, and more generally, in predication of truth.