A genitive or possessive case is available as an alternative to the preposition de.
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In his hands, the Court of St. James's, to which all ambassadors to Britain pay their respects, loses its possessive case.
From the time.com
In English, this survives only in who, which has a possessive case form whose and an objective case form whom.
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Some languages have no distinctive possessive adjectives, and express possession by declining personal pronouns in the genitive or possessive case, or by using possessive suffixes or particles.
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For example, a noun may have separate markers for number, case, possessive or conjunctive usage etc.
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Despite the above, the English possessive did originate in a genitive case.
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Relativised verb forms may, and often do, take nominal possessive endings as well as case endings.
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Possessive pronouns and possessive adjectives agree in person, number, gender, and case.
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Possessive noun phrases inflect for their possessor, as well as for case.