This example illustrates how to diagram an infinitive phrase being used as a noun in the position of an object of a preposition.  "To leave for Europe" is the infinitive phrase.  (NOTE: THE PREPOSITION IS NOT PART OF THE PHRASE.)  The preposition "about" is placed on the slanted line below the verb, "was".  Then the infinitive is placed on a standard in the position of object of the preposition.  "To" is on the slanted line, "leave" is on the horizontal line, and the prepositional phrase: "for Europe" is diagrammed under the word, "leave" as a prepositional phrase.  The infinitive phrase as an object is sometimes called "infinitive objective construction" in some books. Francine was about to leave for Europe.

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