Sure! Here is the requested highlighting/underlining for each sentence:
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Noun Phrase: Once upon a time, a brave young knight ventured into a mysterious forest.
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Verb Phrase: His shining armor was gleaming in the pale moonlight.
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Adjectival Phrase: His loyal, trusty horse guided him farther and farther into the dark, foreboding forest.
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Adverbial Phrase: Without hesitation, the knight charged forward boldly and courageously into a dark cave.
If you're looking for specific formatting (like bold or italics), please let me know!