Two-Component Teaching System That Understands and Corrects Mistakes

TWO-COMPONF~ TEACHING SYSTEM THAT UNDERSTANDS ~ CORRECTS MISTAKES Elena BORISSOVA Institut Russkogo yazyka imP~shkina Moscow Abstract This paper presents a computer-tool tea- ching system supplied by a language proce- ssor. Its aim is to correct mistakes in texts written by foreign students learning Russian as a second language. Since a text may include grammar mistakes, the system cannot use morphological analysis to fool extent. So one must compile a programm capable of finding and correcting mistakes without traditional means of analysis. To solve this problem we prepone a system that includes a vocabalary and rules of finding and re-writing words. So the pro- cess consists of finding word stems and than correcting word endings . Semantic and syntactic information("a model of ru- ling"/Mel'~uk 1974/~ necessary for that is written in the vocabulary of verbs as a frame. The slots of this frame con- tain semantic and morphological infor- mation about words that depend on this vord~. The vocabulary containing now approxi- mately 200 lexemes is enough for beginners I • Introduction As a rule, computer-tool teaching pro- grams ca~ do without language processors. That gives us an opportunity to use Perso- nal computers and other available and in~ expensive means. But such programs can be used only for several types of exercises: mostly those that include substitution or insertion of listed words and endings in a sentence. 68 USSR Such exercises train the student to use correct]F ~rds and expressions° It is im~ possible to modell exercises of the so cal~ led communicative type / Kostemarov et ale 1982/ that form the skills of spontaneous speech ( a pupil constructs some sentences expressing his thoughts on a definite toy pic). While doing such exercises one cannot deal with a limited list of variants as th6~ re exists an infinite number of them(they are innamerable if a pupil has mastered even an elementary course). That is why we need a language aualisis processor in a computer-assisted teaching program aimed to teach somebody t%s~ the language~ to ' c emm~uic ate '. There exists a lot of language analysis and synthesis programs of Russian applied in Automatic translation, Natural langu~ age dialogue systems etc. Nevertheless it is impossible to ase them in computer as~ sisted teaching programms.0n the one hand the majorit~ of them are oriented to the scientific or technological language. On the other - and more importantly - as a rule they cannot deal with texts contai- ning mistakes. Those systems that'under~ stand' a text with mistakes do net notice them or they correct them only printing them on a display/Carbonell,Hayes "198#/ So it is necessary to compile a pro- gram capable of finding and correcting mistakes° This problem is new for compu- tational linguistics. 2~ Description of language processor To solve the problem we propose a two- compone~tt language processor that provl~des morphological, synt~.actic and (to some ex- tent) semantic analysis of a text with mis- takes, ~d then it synthesises correct sen- tences which express identical meaning to …

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