The Introduction of one essay should introduce the essay’s topic and the writer’s position.
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If you are overly formal in a situation that calls for informality, it doesn’t matter since the readers can still understand your meaning.
Tone is the readers' emotion that’s behind a piece of writing, such as humorous or sad.
Both “confident” and “egotistical” have positive connotations.
A word can have different connotations in different contexts.