A good deal of work in language acquisition has been devoted to children's interpretation of sentences that contain the universal quantifier, e. g., every in English. It has been observed in several experimental studies and across several languages that some school-age children experience difficulty in interpreting such sentences (e. g., Inhelder & Piaget, 1964; Roeper & de Villiers, 1991; Philip, 1995). Non-adult responses from children have been found in various conditions, including the circumstance exemplified in the picture in Figure 1, where three boys are each riding an elephant and a...