than' comparative structure. From Random House: Usage note Whether 'than' is to be followed by the objective or subjective case of a pronoun is much discussed in usage guides. ' When 'than' is followed only by a pronoun or pronouns, with no verb expressed, the usual advice for determining the case is to form a clause mentally after 'than' to see whether the pronoun would be a subject or an object.
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The arrangement was more a formality than a genuine partnership of two nationsThis and your other examples are all varieties of the 'more...than' comparative structure. From Random House: