1. Infinitive phrase as subject complement: "to engage with people who hold different opinions" is used after "valuable" to explain what is valuable, showing a complex sentence structure.
2. Present simple tense: The answer uses present simple tense throughout (e.g., "It broadens your perspective", "It encourages open-mindedness") to state general truths, which is appropriate for this type of question.
3. Gerund as subject: "Listening to others" is used as the subject of the sentence, showing flexibility in sentence construction.
4. Relative clause: "who hold different opinions" is a relative clause that adds detail to "people", making the answer more precise and complex.