Two notions of strong equivalence In this talk, I propose two notions of equivalence between grammars and grammar formalisms that are useful for comparing not only which strings can be generated, but also how they are generated. If a sentence is ambiguous in a language, a suitable grammar should derive that sentence in multiple ways....

Can children use tense and aspect morphology to learn novel verbs? How do children learn how their language marks tense and aspect? How do they disentangle what marks tense and what marks aspect? I consider these questions and present some preliminary results from a study investigating whether English-acquiring children can use tense and aspect morphology...