Style

  Style can described as mode of expression in 

  language.  Style is more than that for there are

  style guides which purport to help us write

   grammatically acceptable prose.

  Bartleby

  The above link will take you to a well known online  

  bookseller.  Bartleby provides online links to The  

  Element of Style by William Strunk Jr.

   Lynch

  Jack Lynch offers an index of the elements of   

  English in common contemporary usage.  His 

  comments and explanation of the choice of the 

  indefinite article, a or an being subject to sound

  rather than to the letter is something that is not 

  being taught in our schools.