1. Passive voice: "are considered unlucky," "are also seen as a bad gift," and "are avoided too" all use the passive voice, which is appropriate for describing general beliefs or customs.
2. Complex sentences with cause and effect: The answer uses "because" and "since" to explain the reasons behind the customs, showing good use of complex sentence structures.
3. Present simple tense: The answer consistently uses the present simple tense ("are considered," "sounds," "are avoided") to talk about general truths and cultural practices.
4. Listing with examples: The answer uses phrases like "for instance" and "like" to introduce and clarify examples, which is a natural way to elaborate in spoken English.