“之所以”起句是否规范？自五十年代以来,国内语法学界就零星地讨论过这个问题,普遍认为用“之所以”起句是不规范的。这个问题可以进一步探讨,现笔者根据掌握的语言材料,就此提出一些问题,以求教于语言学前辈和同道。一吕叔湘、朱德熙两位先生认为:“‘之所以’只用在句子中 “The reason” starting sentence is normative? Since the 1950s, the domestic grammar academics have discussed this issue sporadically and generally consider it inappropriate to use the phrase “why”. This issue can be further explored, now the author based on the language of the material, in this regard put forward some questions to learn from linguistic predecessors and fellow. A Lu Shuxiang, Zhu Dexi two gentlemen think: "’The reason’ is only used in the sentence