最后列举了一些英汉疑问句的特殊情况。如：回声问句和多个疑问词问句等。

Finally, special cases in English and Chinese wh-questions are provided here, such as echo questions and multiple wh-questions.

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下面我们再作一组练习把语法和词汇重复练习一遍. 练习的作法是老师用疑问词提出问句, 比方 What did the bank permit Kate to use?

M: What did the bank permit Kate to use?

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本文采用贝叶斯分类器，提取问句主干以及包含疑问词的分支作为特征进行问题分类。

Then we employ Bayesian classifier to classify these questions. Answer extraction is the most crucial part for question answering system.

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