Learner's definition of WHOM
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used in formal writing or speech*who的宾格，用于正式书面语或正式口语 -
To whom am I speaking?阁下是哪位？
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His brother, with whom he is very close, works for the same company.他跟哥哥关系亲密，都在同一家公司工作。
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I was introduced to the artist, whom I was anxious to meet.我被介绍给那位我很想结识的艺术家。
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an author whom I had never heard of一位我从没听说过的作家
Usage用法Whom is a more formal word than who and is not commonly used in ordinary speech and writing, where it can seem awkward and unnatural.*whom比who更正式，一般不用于日常口语和书面语，否则会显得别扭和不自然。 -
(formal) To whom did you speak? = (formal) Whom did you speak to? = (more commonly) Who did you speak to?你跟谁说话？
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(formal) We weren't sure whom to hire. = (more commonly) We weren't sure who to hire.我们不确定该雇用什么人。
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(formal) The person to whom we spoke was very helpful. = (formal) The person whom we spoke to was very helpful. = (more commonly) The person who/that we spoke to was very helpful.跟我们说话的那位是个热心肠。
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(formal) Her brother, whom I met last year, is an attorney. = (more commonly) Her brother, who I met last year, is an attorney.她哥哥是名律师，我去年见过他。