1.Infinitive phrase as a subject complement: "opt to travel within their own country" uses an infinitive phrase as a subject complement to describe the action of individuals, adding complexity to the sentence.
2.Adverbial phrase of reason: "due to the familiarity and comfort it offers" functions as an adverbial phrase of reason, explaining why individuals prefer to travel within their own country, enhancing the clarity and depth of the response.
3.Present participle as an adjective: "Communicating in their native language" uses the present participle "communicating" as an adjective to describe the action, adding richness to the sentence structure.
4.Comparative structure: "making interactions smoother and more enjoyable" uses the comparative structure "smoother and more enjoyable" to compare the quality of interactions, demonstrating a good command of language.