What is the difference between language, structure and form?

Language focuses specifically on the use of words and devices (such as the use of personification, ceasura, and so on), while the structure is concerned with how the piece of writing develops - not through the choice of words, but through the careful choice of punctuation, as well as the order in which events appear in the writing, which have been carefully and deliberately ordered for specific effect. Form is the more factual side of the analysis in the respect that it focuses on the genre of the piece of writing, the characters, and the narrative point of view - all of which influence the language and structure.