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Help Professor Higgins write his highly formal academic paper on 18th-century politics. Select ALL the sentences that correctly use fronted prepositions (placing the preposition before the relative pronoun) for a strict formal register.
The correct answers are The monarch to whom the secret letter was addressed never received it. and The controversial treaty upon which the two nations agreed was signed in 1812.
In highly formal English, prepositions are often placed before the relative pronoun rather than at the end of the clause.
When placing a preposition before a relative pronoun, you must use whom (for people) or which (for things). You cannot use who or that immediately after a preposition.
While "The monarch whom the secret letter was addressed to..." is grammatically valid in everyday English, it leaves the preposition stranded at the end, which does not fit the strict formal requirement of "fronting" the preposition asked for in the prompt.