Extract:
Which word is used incorrectly in the following sentence?
For who was that e-mail intended?
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A
For
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B
who
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C
that
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D
intended
The word "who" is used incorrectly; the objective case "whom" is required after the preposition "for."
A) For
"For" is correctly used as a preposition introducing the object of inquiry. No error affects this preposition.
B) who
"Who" is subjective case, but it follows the preposition "for," which requires an object—demanding objective case "whom." Standard grammar requires "For whom was that e-mail intended?" though informal speech often substitutes "who."
C) that
"That" functions correctly as a demonstrative adjective modifying "e-mail." No grammatical error affects this determiner.
D) intended
"Intended" is correctly used as a past participle forming the passive voice construction "was intended." No verb form error exists here.
Conclusion
Prepositions require objective case pronouns as their objects. Following "for" with subjective "who" violates case rules; "whom" is the grammatically correct objective form required after prepositions in formal English.