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Investigates the factors that determine the order in which English speaking children acquire wh-questions. Contribution of complexity and input frequency to wh-question acquisition; Relationship between order of acquisition and input frequency; Correlation between complexity and the frequency with which mothers use particular wh-words and verbs.

Investigates different accounts of early argument structure acquisition and verb paradigm building through the detailed examination of the acquisition of the verb Go. Comparison of Children's uses of the different forms of Go with respect to syntactic structure and the semantics; Predictor of the children's use of different forms of Go in particular structures and in expressing particular meanings.

Investigates the role of performance limitations in children's early acquisition of verb-argument structure. Difference in the ease of production of transitive and intransitive frames; Proportion of verb utterances by children who understands distinction of frames; Basis of the selection of argument structure.

Discusses the implications of widespread distributional learning of children in early language development. Lexically-based positional analysis; Development analysis; Multiword utterances; Prototypical agent-patient roles; Implications of widespread distributional learning.

Examines the link between observational and checklist measures in gauging vocabulary size and composition in children. Existing correlationship; Influence of maternal-report bias and sampling bias on the measures; Unreliability of the measures in gauging proportion of nouns in children's vocabularies; Accuracy of measurement through detailed longitudinal studies.