This example illustrates how to diagram a gerund phrase as an object of the preposition.  Remember that a gerund is an -ing or -ed form of a verb, which is being used as a nound and thus can be used as an object of the preposition.  The preposition is placed on the slanted line below the word it this case the verb, "was fired".  "Playing cards" answers the question, what? after the preposition "for".  Note how it is diagrammed on a standard in the position of the object of the preposition and the direct object of the gerund, "playing," is "cards".  "Cards" is diagrammed after the vertical line (not cut through the base line) after the gerund. He was fired for playing cards.


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