Politeness Basics

Unlike many other languages, Vietnamese has no verb conjugation. A verb like ăn (to eat) stays exactly the same whether you are speaking to a child or your grandparents, and it never changes form to show tense or who is doing the action.

To show respect, Vietnamese relies on two main pillars:

• Kinship Pronouns: Instead of generic words for "I" and "you", speakers use family terms based on age and status, such as anh (older brother/young man), chị (older sister/young woman), or em (younger sibling/person). Crucially, these pronouns work in matching pairs. If you address the listener as anh, you must refer to yourself as em. You cannot mix and match them arbitrarily. If you do not know someone's age, it is safest to default to anh or chị to be polite, or use the neutral tôi and bạn in generic contexts.
• Polite Particles: You add specific words to your sentences to show deference.

The most common polite particles are dạ, vâng, ạ, and thưa. There is a regional nuance: Northerners use dạ to acknowledge when called and vâng to agree, while Southerners use dạ for both. Northerners also frequently combine the two into dạ vâng as a single, highly polite compound agreement. The casual equivalent to these polite "yes" words is ừ, which should only be used with close friends or people younger than you.

Dạ (and vâng) can stand completely alone as a one-word response meaning "Yes", "I understand", or "I'm listening". They can also be placed at the beginning of a sentence. For example, you can say "Dạ không" for a polite "no".

It is important to distinguish between an acknowledgment "yes" (dạ/vâng) and a factual "yes". To answer a factual yes/no question, the primary method is to repeat the main verb or adjective. You generally only use có if the question asks about possession or existence, or uses the có ... không? structure. You can combine these factual answers with polite particles, such as saying "Dạ có ạ" or "Dạ đúng ạ" when those specific words apply.

Thưa is placed before a pronoun or title to respectfully address someone. It is highly formal and respectful, often used specifically for teachers, grandparents, or bosses, and is frequently combined with dạ (like "Thưa bác" or "Dạ thưa anh").

Ạ is placed at the absolute end of a sentence to soften the tone and show respect to someone older or of higher status. Note that ạ is heavily used in the North, while the South relies more on placing dạ at the beginning of the sentence. It is very common to combine these particles to "bookend" a sentence for standard politeness, such as saying "Dạ không ạ" or "Dạ vâng ạ".