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shall[shall 词源字典]

shall: [OE] The etymological meaning of shall is ‘owe’. It goes back to a prehistoric Germanic base *skal-, *skul- which also produced German sollen ‘ought to’ and schuld ‘debt’. Its use in English as an auxiliary verb denoting future time evolved via the intermediate senses ‘ought to, must’ and ‘be to’. The notion of obligation survives in should, which originated as its past tense.
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