Sentence -> Nounphrase Verbphrase   
Nounphrase -> Boy              
Nounphrase -> Girl           
Boy -> john
Boy -> ajit
Girl -> pima
Girl -> barkha
Verbphrase -> Verb Modlist Adverb with  Nounphrase
Verb -> runs                    
Verb -> walks                  
Modlist ->                    
Modlist -> very Modlist      
Adverb -> quickly           
Adverb -> slowly