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Modals
------------ my brother come, give him this message.
Explanation and memory cue
The correct modal verb to complete the sentence is 'Should' because it is used to indicate a conditional or probable event in the future. The sentence 'Should my brother come, give him this message' is a formal way of saying 'If my brother comes, give him this message.' 'Will' is not appropriate here as it does not convey the conditional meaning implied by the sentence structure.