title: mapping English words to their singular forms
body: <p>Examples:
  mapping a plural noun to its singular form:  children --> child, boxes ---> box
  mapping comparative and superlative of adjectives and adverbs to their basic form
  mapping verb .... </p>
  
  <p>I once found an open source resource to achieve it. As I remember, it is a datasheet?/spreadsheet?/database? of the mapping. Does anyone know the open source resource, or any alternative/better solution?
  I'm coding in java.</p>