1. Hello! (How do you do?) 你好！
2. How are you?-I'm fine. Thank you. and you?
你好吗？我很好。谢谢，你呢？
3. Good morning / afternoon/evening/night.
早上好/下午好/晚上好/晚安。
4. Excuse me。(sorry. I'm sorry)
打搅一下(对不起/不好意思)
5. Thank you!谢谢你！