Answer: Tone gives shape and life to a story. Through tone, the attitude and mood of a literary work are created and presented. It gives voice to the characters, both literally and figuratively. Tone also allows the reader to learn about a character's personality and disposition. Formal language is less personal than informal language. It is used when writing for professional or academic purposes like university assignments. Formal language does not use colloquialisms, contractions or first person pronouns such as 'I' or 'We'. Informal language is more casual and spontaneous.
