核心问题
Come winter, we'll have to pay a good deal more for vegetables and fruit. 请问句中的 come winter 为什么不保持主谓一致关系？
词典解答
come 在这里是现在虚拟式(be 型虚拟式)，故没有人称变化。当它用于时间从句时，可以不用连词。上句中的 come winter = when winter comes。
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She will be eighteen years old come Easter. 复活节到来时,她就十八岁了。
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I almost think if I could do like you, drop everything and live out on the ground—but it might be, come night I shouldn't like it. (Curme) 我简直想我如能学你的样，丢开一切，露宿在外面地上——但是，当夜晚降临时，我可能就不喜欢那样了。