This example illustrates how to diagram an adjective or adjectival prepositional phrase.  If you remember, an adjective modifies a noun or pronoun and answers the questions:
  • Which?
  • What kind?
  • How many?

So now, we are showing that a phrase (group of related words) can also act like an adjective.  This prepositional phrase "over the river," is telling which bridge one is talking about...the one over the river.  Thus, the prepositional phrase is acting like an adjective and is diagrammed below the noun it modifies.

That bridge over the river often needs some repairs.

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