12. Causes for the Increase in the Yin-Ping Category
                                                                                 
        
                
         12. 阴平类增加的原因 
    
        
          Chung-yu.	Chen 陈重瑜
            
    
    
        Abstract 摘要  
        
        
       
 12.1 Five Types of Evidence of High-Frequency Colloquial Forms Changing towards the Yin-Ping Tone. 
12.1.1 Reduplicates.
12.1.2 Onomatopoetic forms.
12.1.3 Monosyllabic verbs.
12.1.4 Colloquial (as opposed to literary) vocabulary.
12.1.5 Colloquial (as opposed to literary) readings.
12.2 Early Stage of Sound Changes Giving Rise to Etymological Confusion.
12.3 Closing Words.