Tracing all the different ways in which Chisholm attempted to formulate Brentano’s Thesis would require a book-length discussion. Instead, we here focus on one illustrative example. In Chapter 11 of [PPS], Chisholm developed a version of Brentano’s Thesis that turned on the notion of an intentional sentence. He identified three marks of intentionality. Any noncompound sentence that manifested one of these marks would be identified as an intentional sentence. The first mark of intentionality recalls Brentano’s idea of intentional inexistence. Consider the sentence ‘John is thinking about the Loch Ness Monster’. Neither this sentence nor its negation entails either that the Monster exists or that it does not exist. Any such simple declarative sentence is intentional.