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Tone in fiction is the attitude of the narrator or viewpoint character toward story events and other characters. In a story with first-person POV, tone can also be the narrator's attitude toward the reader. In non-fiction, tone is the writer's attitude toward subject matter and reader
It’s a way to make the interview more like a conversation and can help put you at ease.
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this happend because professor snape was trying to read his mind(Legilimency) to