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Tone is conveyed through the author's words and details. Use context clues to help determine the tone. In literature an author sets the tone through words. The possible tones are as boundless as the number of possible emotions a human being can have.
1 It's hard to make other people feel something if you don't feel it yourself. Think about times when you've felt happy or sad in real life, not just when reading other books. The more you put yourself into your story, the more real emotion it will have.  Don't try to write for someone else.