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One is if you might need to risk your life to save a family member. The reward heavily outweighs the risk because other wise you could never see them again.
Tone is the author's attitude toward the speech. Since we know that Dr. King was the author and presenter of the speech, this was one of inspiration, seriousness, hope, and encouraging. This is not to be confused with mood. Mood is your feelings from the text. So, while the tone may be one of hope, to say it was 'hopeful' would be a mood (if that is indeed what you are feeling when hearing it.)
The Greeks first used that word to refer to ppl who didn’t speak Greek or were non Greek
