Here's how you can highlight or underline different phrases in the sentences you provided:
Highlight or underline a noun phrase in the following sentence:
Once upon a time, a brave young knight ventured into a mysterious forest.
Highlight or underline the verb phrase in the following sentence:
His shining armor was gleaming in the pale moonlight.
Highlight or underline an adjectival phrase in the following sentence:
His loyal, trusty horse guided him farther and farther into the dark, foreboding forest.
Highlight or underline an adverbial phrase in the following sentence:
Without hesitation, the knight charged forward boldly and courageously into a dark cave.
Highlight or underline a prepositional phrase in the following sentence:
Deep within the cave, he discovered a hidden treasure inside a dusty chest.
Highlight or underline the participial phrase in the following sentence:
Opening the ancient chest, he felt a surge of triumph.
Highlight or underline the absolute phrase in the following sentence:
The treasure found, the knight returned to his kingdom to share his riches.