Chapter Four: The Aspect Hypothesis.

The Aspect Hypothesis, p.192. In Primary Language Acquisition, p.193. In Second Language Acquisition, p.195. Grammatical and Lexical Aspect, p.205. Investigations of the Aspect Hypothesis in Second Language Acquisition, p.227. The Spread of Perfective Past, p.228. The Spread of Imperfective Past, p.234. The Spread of Progressive, p.237. Overgeneralization of Progressive in States, p.238. Sample Study: The Distribution of Verbal Morphology in Learner Narratives, p.239. Assessing the Influence of Lexical Aspect, p.251. Challenges to the Aspect Hypothesis, p.265. Chapter Summary, p.272 [ABSTRACT FROM AUTHOR]