The paper reports on the recent work in the development of a grammar checker for Latvian. The grammar checker is using extended context free grammar (CFG) formalism for description of correct and erroneous syntactic structures. The grammar checking engine uses both of these sets of the rules. The grammar checker is used by language learners as well as native speakers. Our recent work is directed at the creation of an error-annotated corpus of texts that are created by non-native speakers. Based on this corpus, the CFG rule set is refined.
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