1.64 always used with possessives

Some nouns are almost always used with a possessive, that is a possessive determiner, 's, or a prepositional phrase beginning with 'of', because you have to indicate who or what the thing you are talking about relates to or belongs to.

• He has been associated with Everyman Opera since its inception.
• Advance warning of the approach of enemies must have been of the greatest importance.
• ...the portrait of a man in his prime.