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The idea of Proto-Indo-European (The Language), is, is, is, is, is, is, is…

- - - - a system if internal vowel changes expressing different morphological functions
- - - - Morphological variations
  - - - Basic form:
        
        The basic, unchanged root.
      - Full-grade form
        
        A form with e-vocalism
      - O-grade form
        
        A form with o-vocalism
      - Zero-grade form
        
        A form with zero-vocalism
      - Lengthened-grade form
        
        A form with lengthened vocalism
      - Suffixed form
        
        A form with one or more suffixes written with an internal hyphen
      - Prefixed form
        
        A form with a prefix, written with an internal hyphen.
      - Extended form
        
        A form with an extension or enlargement
      - Nasalized form
        
        A form with a nasal infix, written with internal hyphens
      - Reduplicated form
        
        A form prefixed by its own initial consonant followed by a vowel