在语法层面，本文采用C4.5决策树算法将问题分类为是非问句、正反问句、特选问句和特指问句四种类型；

In syntax level, we classify the question into four categories by C4.5 algorithm, such as yes-or-no interrogative, specially related interrogative, and so on.

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同时识别和理解的查询语言覆盖面从过去人们只研究祈使句和特殊疑问句扩展到是非问句、选择问句和正反问句等句型。

In the past, people only studied the imperative sentence and special question, now the yes-or-no questions and the positive and negative questions are also studied.

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