Abstract. The paper discusses the development of spoken Lithuanian corpora. In the analytical part longitudinal child language data as well as adult conversations are discussed in view of the issues that occurred during the period of data collection, transcription and coding. The data are transcribed and coded according to the requirements of CHILDES.The second part of the paper presents a corpus based analysis and provides preliminary results. The data of adult-directed speech, child-directed speech and child speech are analysed to reveal the frequency distribution of parts of speech. Spoken language is compared to written language in order to observe the tendencies of usage. The main differences and similarities within the spoken language registers are discussed as well.

Child-directed speech (CDS) is very important for the language development of a child. When talking to children adults modify their language by simplifying it and adapting it to the language acquisition stage of the child. Words and constructions that are used in CDS are aqcuired earlier by the child.This paper analyses the morphological modifications of Lithuanian CDS.The analysis proves that the most frequent morphological modifications of CDS include: 1) the higher frequency of verb tokens over noun tokens, 2) the low frequency of indefinite pronouns, demonstrative pronouns, and adjectives, and 3) the high frequency of diminutives and interjections.Prevalence of the denominative parts of speech has been influenced by the cognitive function; the abundance of verbs is conditioned by short utterances. The high frequency of diminutives is related to pragmatic function, intimacy, and emotions

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