Shall With Determination
The British traditionally use shall to express determination or intention on the part of the speaker or someone other than the subject of the verb. Fowler’s offers an example from British author Evelyn Waugh: “One day you shall know my full story.” This does seem to offer a different connotation than “One day you will know my full story.” It makes the author sound more determined. However, using shall in this way isn't common in America (1).
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