Resumes and cover letters need perfect grammar. Here are selected rules contributed by several experts including Laura A. DeCarlo and Dr. David F. Noble.

• Laura DeCarlo's Competitive Edge Grammar Rules
  
  
• Dr. David F. Noble's Errors and Stylistic Weaknesses in Cover Letters
  
  

A While vs. Awhile

Awhile: Adverb which means "for a time" ("stay awhile").

A while: When "while" is the object of a prepositional phrase, like "Lend me your monkey wrench for a while" the "while" must be separated from the "a."

Note: If the preposition "for" were lacking in this sentence, "awhile" could be used in this way: "Lend me your monkey wrench awhile."