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The world wide web is a mine of language data of unprecedented richness and ease of access (Kilgarriff and Grefenstette 2003). A growing body of studies has shown that simple algorithms using web-based evidence are successful at many linguistic tasks, often outperforming sophisticated methods based on smaller but more controlled data sources (cf. Turney 2001;Keller and Lapata 2003). Most current internet-based linguistic studies access the web through a commercial search engine. For example, some researchers rely on frequency estimates (number of hits) reported by engines (e.g. Turney 2001). Others use a search engine to find relevant pages, and then retrieve the pages to build a corpus (e.g. Ghani and Mladenic 2001; Baroni and Bernardini 2004).In

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The present study analyzes morphological productivity for complex verbs in second language acquisition by analyzing a corpus of German as a Foreign Language (GFL). It shows that advanced learners of GFL use prefix and particle verbs relatively frequently and productively but less so than native speakers do and discusses these findings in the light of different linguistic models and acquisition theories. It argues that corpus data must be evaluated against good models and that it is necessary to make the categorization decisions available as annotations.

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