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If the mother asked "What are your plans for today?" the child could have responded "I'm going to the store."
If the child said "I'm going to the store" in a simple, matter of fact way, he or she would not have elicited a scolding response from the mother.
However, if the child responded with a whiney "I'm going to the store!" because he or she could simply not be bothered with answering the mother's question, then the entire meaning of the situation changes.
What is tone?