What are the essential features that permit a sentence to convey a complex idea? What must language users do in order to produce and understand meaningful sentences? And what enables humans, and perhaps apes and robots, to learn this remarkable skill? Janice Moulton and George Robinson offer a fresh and readable approach to these questions. They present an important new theory that clarifies the relationship of language to thought. This theory, which will attract considerable critical attention, combines a general analysis of language with an original cognitive model of syntax and language...