※ 引述《scju (QQ)》之铭言： : 这句我在您文章底下的推文已经说过了，就是「to+名词子句」。 : 可以这样理解：who may it concern?（它可能涉及到谁？） : 改成肯定句、名词子句的形式放在to後当受词：To whom it may concern（致它可能涉及 : 到的那些人，文言一点就变成「敬启者」）。同样情况，who在to後面，是明显的受词位 : 置，所以用whom。因此这句也不是形容词子句，更不是什麽没有先行词的形容词子句。 whom it may concern是没有先行词的关系子句。 但是关系子句未必是形容词子句，有些是名词子句 这里的whom是concern(vt)的object。 To的object/complement是整个子句whom it may concern。 https://www.thoughtco.com/object-of-a-preposition-op-1691447 https://parentingpatch.com/prepositional-complement-english-grammar/ 这里的whom充当复合关系代名词，可算是比较古老的英语用法。 To whom it may concern = To the person(s) whom/who it may concern 再举一个whom充当复合关系代名词的例子: “whom the god loves dies young” ─ Lord Byron 现代的英语的复合关系代名词是what, whatever, whoever, whomever. I will give the book to whoever needs it. whoever可以充当子句的主词。 *I will give the book to whomever needs it. whomever不能充当子句的主词。 I will give the book to whomever you like. whomever可以充当子句的受词。 I will give the book to whoever you like. whoever通常可以代替whomever充当子句的受词，而且比往往whomever更自然。 -- Alice Phillips, former High School Principal at Chicago Public Schools (2006-2010) Answered Aug 9, 2018 "Whom it may concern' is a dependent clause thereby being an incomplete thought although it has a subject and verb. "To whom it may concern" is a prepositional phrase used primarily as a salutation of a letter when the receivers of the letter are ambiguous and unknown to the writer of the letter. ※ 编辑: supercilious (111.240.123.24 台湾), 01/30/2020 19:57:30