xin lỗi

1. Apologizing for a Mistake:
When you do something wrong, use xin lỗi. To be polite, frame it with pronouns: [Speaker] + xin lỗi + [Listener] (e.g., Em xin lỗi anh). For a softer apology, you can use the variation with cho: Cho tôi xin lỗi (Let me apologize). If speaking to an elder, start with Dạ (Dạ, xin lỗi...) or add the respect particle ạ at the end (Xin lỗi ạ). Using Dạ is especially common in Southern Vietnam.

2. Stating the Reason:
To explain why you are apologizing, use xin lỗi vì + [reason] (e.g., Xin lỗi vì tôi đến muộn - Sorry for arriving late).

3. Interrupting / Asking a Stranger:
You can use it to politely interrupt or ask for information: Xin lỗi, cho tôi hỏi... (Excuse me, may I ask...).

4. Polite Refusals:
It is also used to politely decline an invitation or request: Xin lỗi, tôi bận rồi (Sorry, I am already busy).

5. A Cultural Alternative & Modern Slang:
For minor inconveniences or asking someone to overlook a small issue, Vietnamese people frequently use thông cảm (to sympathize / understand) instead of a direct apology (e.g., Thông cảm cho mình nhé - Please be understanding). Among younger people and friends, it is also common to mix in English, saying Sorry nha or Sorry nhé.

6. What NOT to do:

• Do not use it to hail a waiter or shopkeeper. Use [Pronoun] ơi instead (e.g., Em ơi!).
• Do not use it to express sympathy. For general bad news, use rất tiếc (to regret). For mourning or funerals, use chia buồn (to share sadness).
• Do not overuse it for minor bumps in a crowded place. A simple smile and nod is often enough.

7. How to Respond:
When someone apologizes to you, the standard replies are Không sao (No problem / It's okay) or Không có gì (It's nothing).

8. Pronunciation Tip:
Pay close attention to the ngã (tilde) tone on lỗi. Mispronouncing this tone can change the word's meaning entirely! Note that in the Southern dialect, the ngã tone is often pronounced like the hỏi (hook) tone.