核心问题
（a）It's two hundred miles from Boston to New York.
(b) From Boston to New York is two hundred miles.
请问句(b)是否是正确的英语？介词短语能充当主语吗？
词典解答
句(b)是正确的表达方法。这就是说，介词短语也被承认有权充当句子的主语。
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To Beijing is not very far. (AEG) 到北京不很远。
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From racing to politics was a short step. (VOA) 从赛马到政治, 只是一步之隔。
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From here to Philadelphia is only a hundred miles. (CGEL) 从这里到费城只有100英里。