The relationship between grammatical knowledge and reading ability in third grade good and poor readers was investigated. Two aspects of grammar – binding and control – were assessed to determine whether poor readers had syntactic deficits. These principles both relate to the interpretation of pronominal elements. Interpretations were assessed through a sentence–picture matching task in which picture depictions of all the possible interpretations of pronominal elements in verbally presented sentences were included. The only sentence type that differentiated the two reading groups was performance on sentences related to one of the binding principles, Principle B. Since obedience to Principle B probably involves pragmatic as well as syntactic principles, this finding suggests another way that good readers may differ from poor readers.