Three different ways to determine mood in literature

Diction. Diction is the choice of words and how the author decides to express them.

Setting. Setting is where a story or scene takes place and can significantly affect the mood of a piece.

Imagery. Imagery also comes into play.

Explanation:

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the excerpt from chapter 2 of "animal farm", by george orwell that is an example of foreshadowing is "these three (snowball, napoleon, and squealer) had elaborated old major's teachings into a complete system of thought to which they gave the name of animalism." animal farm is an allegory of how czarist russia developed into communist russia with all its corruption. old major's teachings represent marx's theories turned into communism, animalism, by the three pigs. this foreshadows the oppression and corruption that will follow this revolt.