"do Not Say" Sentence Study

After getting some statistical data about the complex sentence "BieShuo",we find that "BieShuo......JiuShi......Ye/Dou......" is a familiar pattern of thecomplex sentence "BieShuo". When we analyze the sentence pattern"BieShuo......JiuShi......Ye/Dou......", the theory of the small triangle is used.From the three angles of grammatical expression, meaning and pragmatic value,we argue the characteristics of "BieShuo......JiuShi......Ye/Dou......" roundlyand the verification of the three angles. After that, the paper analyze the semanticpreset of "BieShuo......JiuShi......Ye/Dou......" in formal logic and express it ina logic formula. On the base of that logic formula we contrast "BieShuo......JiuShi......Ye/Dou......" with "BuDan......ErQie......", and transform the twosentence patterns into each other, so, it is more easy to contrast them and it could provide a new method for contrast between interrelated complex sentences. At last, based on the conclusion discussed above, we point out some questions in teaching about "BieShuo" and we are intended to put forward some advices to solve it.