Who knows but...成分分析
Who knows but he may go ? (谁知道他会不会去？）
刘毅语法上说"but he may go"是名词性从句作know的宾语， 即but引导名词性从句。
我没懂，不理解。 麻烦老师详细分析一下这里的but究竟是何用法？如何理解？如何分析成分？
最佳答案 2019-12-24 10:55
费致德《现代英语惯用法词典》对这个问题有较详细的说明。摘录如下：
在动词say, think, conceive, conclude, believe, know, say, be sure等的疑问句或否定句里，but, but that, but what意味着双重否定，结果成为肯定。but这种用法现已少见。but what是but that的代用语，常用在俗语里。例：
I could hardly believe but (but that. but what) it was all real (that is wasn't all real).我很难相信它不全是真的。
Who knows but (that) everything will come out right?难道不是每个人都知道结局可以没事吗？
▲《21世纪英汉汉英双向词典》也有介绍：
but (that)[(口语)what]用在否定句或疑问句的say，know，believe，be sure等之后引导名词从句表示“不 [非] …”。
Who knows but that he may be right? 谁知道他 (说得) 不对?(说不定他是对的 [说得对] )
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其它 1 个回答
Who knows but he may go ? = Who knows but that he may go ?
这里的"but he may go"是名词性从句作know的宾语， 即but引导名词性从句。but that （that 可以省略）的意思是 whether （是否）。
《薄冰英语惯用法词典》指出（p.139）: Who knows but (that) ...? 疑问句式里的 but that虽然相当于that not，但否定的含义较弱，在语义上倒有些接近于 whether 。例如： Who knows but that he may alter his mind ? ( = Who knows that he may not alter his mind ?) 谁晓得他会不会改变主意呢？/ Who knows but that he will come by and by ? ( = Who knows that he will not come by and by ? )谁知道他不久会不会来呢？
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