Students are shown eight sentences each with a grammar mistake and have to match the mistake with the index word in a grammar book.

学生先看八个句子，每个句子中有一处语法错误，学生必须把这些错误类型与语法书上的索引词相匹配。

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Besides, the search steps in probabilistic CYK algorithm is reduced and the probabilistic CYK algorithm is improved by rearranging grammar rules of SCNF and establishing the index table.

此外通过重排scnf语法规则和建立索引表对概率CYK算法进行改进，减少中间搜索步骤所需的时间以提高效率。

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