1. Present simple tense: Used throughout the answer (e.g., "are incredibly popular," "you use it to chat") to state facts and general truths, which is appropriate for this type of question.
2. Appositive phrase: "WeChat, in particular, is almost a necessity for daily life" uses an appositive phrase to add emphasis and detail about WeChat.
3. Relative clause: "because it’s entertaining and keeps you up to date with the latest trends through short videos" uses a relative clause to explain why Douyin is popular, adding depth to the answer.
4. Parallel structure: "to chat, share photos, pay for things, and even book appointments" uses parallel verbs to list the functions of WeChat, making the answer clear and organized.