EngBB Why there is a preposition "of" in the middle of the sentence? Is it necessary to include it? What's the role of this preposition?
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EngBBWhy there is a preposition "of" in the middle of the sentence? Is it necessary to include it? What's the role of this preposition?"of great importance" is a prepositional phrase, used as a predicate adjective. It is rather formal writing, which gives it stronger emphasis.