Shall and will are two of the English modal verbs. They have various uses, including the expression of propositions about the future, in what is usually referred to as the future tense of English. In the latter use (pure expression of futurity), the two verbs are often used interchangeably. In British English, there once was a traditional rule of prescriptive grammar stating that shall is to be used when the subject is in the first person (I or we), and will in other cases.
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