1.Noun as Subject: "Trustworthiness is a cornerstone of true friendship." Here, "Trustworthiness" is used as the subject of the sentence, emphasizing its importance in the context of friendship.
2.Relative Clause: "who can be entrusted with your secrets and who remains reliable in any situation" uses a relative clause to provide additional information about a genuine friend, adding depth to the description.
3.Adjective Phrase: "strong and resilient" is an adjective phrase used to describe the qualities of the relationship, enhancing the expressiveness of the sentence.