◇ Relative Pronouns - Who, Whom
關係代名詞 who 和 whom
Ｗho 和 whom 都是關係代名詞（Relative pronoun），但 who 是用來代替主詞，而 whom 則是用來代替受詞。現在 whom 已經越來越少被使用了，通常都可以被 who 取代。然而在正式的書寫中，或是介係詞之後，仍習慣用 whom。例如 "...but because we haven't yet found people with whom we are sufficiently compatible." 其中的 with whom 可以還原成 "...but because we haven't yet found people whom we are sufficiently compatible with."。
Example：
1. That is not a solution available to most people for whom email has become a necessity.
對於絕大多數那些已把電子郵件是為必要的人來說，那是不可行的辦法。
2. To whom should I write this email?
這封電子郵件該寫給誰？
3. I met an old friend with whom I used to go to school.
我遇到一位以前和我同校的老朋友。