1. Passive voice: "are believed to bring good luck, happiness, or prosperity" uses the passive voice to focus on the general belief about festival dishes, which is a common and effective structure in IELTS answers.
2. Present simple tense: The answer consistently uses the present simple ("are often deeply rooted," "are only eaten," "symbolize") to talk about facts and general truths, which is appropriate for this type of question.
3. Relative clauses: "mooncakes are only eaten during the Mid-Autumn Festival and symbolize reunion and harmony" uses a relative clause to add detail and explanation, making the answer more complex and informative.
4. Present participle phrase: "carrying a lot of traditional and emotional value for families" uses a present participle phrase to add extra information about the recipes, showing a good range of grammatical structures.