※ 引述《scju (QQ)》之銘言： : 這句我在您文章底下的推文已經說過了，就是「to+名詞子句」。 : 可以這樣理解：who may it concern?（它可能涉及到誰？） : 改成肯定句、名詞子句的形式放在to後當受詞：To whom it may concern（致它可能涉及 : 到的那些人，文言一點就變成「敬啟者」）。同樣情況，who在to後面，是明顯的受詞位 : 置，所以用whom。因此這句也不是形容詞子句，更不是什麼沒有先行詞的形容詞子句。 whom it may concern是沒有先行詞的關係子句。 但是關係子句未必是形容詞子句，有些是名詞子句 這裡的whom是concern(vt)的object。 To的object/complement是整個子句whom it may concern。 https://www.thoughtco.com/object-of-a-preposition-op-1691447 https://parentingpatch.com/prepositional-complement-english-grammar/ 這裡的whom充當複合關係代名詞，可算是比較古老的英語用法。 To whom it may concern = To the person(s) whom/who it may concern 再舉一個whom充當複合關係代名詞的例子: “whom the god loves dies young” ─ Lord Byron 現代的英語的複合關係代名詞是what, whatever, whoever, whomever. I will give the book to whoever needs it. whoever可以充當子句的主詞。 *I will give the book to whomever needs it. whomever不能充當子句的主詞。 I will give the book to whomever you like. whomever可以充當子句的受詞。 I will give the book to whoever you like. whoever通常可以代替whomever充當子句的受詞，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. ※ 編輯: supercilious (111.240.123.24 臺灣), 01/30/2020 19:57:30