Final answer:
The sentence 'We biked to Shasta, climbed until dusk, and pitched camp' includes a prepositional phrase 'to Shasta,' another prepositional phrase 'until dusk,' and a verb phrase 'pitched camp.'
Step-by-step explanation:
The sentence 'We biked to Shasta, climbed until dusk, and pitched camp' contains several phrases that can be identified. The phrase 'to Shasta' functions as a prepositional phrase indicating the direction of the biking. 'Until dusk' is another prepositional phrase that describes the time frame of the climbing. Finally, 'pitched camp' serves as a verb phrase that describes the action they took at the end of their journey. Phrases provide additional information about the circumstances or details of the sentence's main actions.