Answering Yes Or No

While Vietnamese is famous for its "echo" system—where you answer by repeating the main verb or adjective from the question—it also has standard words for "yes" and "no" depending on the question type. The answer you give depends entirely on the question frame used.

1. The có ... không? Frame:
Many yes-no questions use the structure [Subject] + có + [Verb/Adjective] + không?.

• Yes: You can simply say Có (Yes). Alternatively, you can "echo" the main verb or adjective exactly as it was asked.
• No: You say Không (No). You can also choose to echo the verb by putting this negative word before it (e.g., "Không đi").

2. The ... chưa? Frame:
Questions asking if something has happened yet use [Subject] + (đã) + [Verb] + chưa?.

• Yes: You say Rồi (Already).
• No: You usually say Chưa (Not yet). You can use không to answer a chưa question, but it changes the meaning to a flat refusal or absolute negative (e.g., "No, and I am not going to").

3. The phải không? Frame:
Tag questions asking for confirmation use [Statement] + phải không? or đúng không?.

• Yes: You echo the tag by saying Phải or Đúng (Right/Correct). While these are the standard answers, native speakers sometimes use Có in casual conversation to affirm the underlying fact.
• No: You say Không phải or Không đúng.

4. The có phải ... không? Frame:
Questions asking to confirm a fact, identity, or ownership use Có phải + [Statement] + không?.

• Yes: You say Phải or Đúng.
• No: You say Không phải.

Politeness & Casual Answers:

• Polite Yes: Use Vâng (more common in the North) or Dạ (more common in the South and Central regions) when speaking to elders or superiors. Note that Dạ is also heavily used in the North by younger people speaking to elders (often meaning "I'm listening" or "Yes, I'm here"), and is frequently combined with "vâng" as "Dạ vâng" for high politeness. These are frequently combined with the frame answers to sound natural (e.g., "Dạ có", "Vâng, đúng rồi", "Dạ chưa").
• Polite No: To say a polite "No", you can use "Dạ không" (common in the South/Central) or "Không ạ" (common in the North).
• The Respect Particle ạ: You can add ạ to the end of any short answer to make it polite (e.g., "Có ạ", "Không ạ", "Rồi ạ", "Chưa ạ").
• Casual Yes: With friends or people younger than you, you can use Ừ or Ờ (Yeah).

Exceptions & Special Cases:

• The verb "là" (to be): This verb cannot be echoed. To say yes, use phải, đúng, or a polite yes. To say no, you must use không phải (or không phải là), as "không là" is incorrect.
• Negative Questions: If someone asks a negative question (e.g., "Aren't you tired?"), answering with a polite yes (vâng / dạ) means you agree with the negative statement ("Yes, I am NOT tired"). This is the opposite of English logic!