Final answer:
Informal language is casual and personal, while formal language is scholarly and reserved. The shift in tone is determined by contextual factors.
Explanation:
Informal language is characterized by its colloquial tone, direct sentences, and personal approach. On the other hand, formal language is more scholarly, reserved for speeches or academic essays, and follows standard English conventions. The change in tone from informal to formal diction is influenced by the context of the communication, such as familiarity between speakers, social relations, and the formality of the setting.
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