Vietnamese Follow-Up Questions

The short version

Follow-up questions keep a conversation alive after the first answer.

Pattern box

question word + detail: Khi nào xong? / Vì sao vậy?

English trap

Do not ask unrelated questions; follow the last answer.

Right vs wrong examples

Instead of this	Say this	Why
Copy the English structure word by word	Cái này là gì?	Use the Vietnamese pattern as a ready-made chunk.
Add extra grammar words because English needs them	Ở đâu vậy?	Vietnamese often stays shorter than English.
Study the rule without a real situation	Khi nào?	Attach the rule to a cafe, taxi, hotel, market, or work sentence.

Core examples

Vietnamese	English	Practice note
Cái này là gì?	What is this?	Useful with pointing.
Ở đâu vậy?	Where is it?	Casual location question.
Khi nào?	When?	Core question word.
Tại sao?	Why?	Core question word.
Như thế nào?	How?	Useful but more formal.
Được không?	Is it possible?	Powerful request ending.
Tôi muốn hỏi về câu hỏi này	I want to ask about this question	Use this to open a this question conversation.
Bạn giúp tôi về câu hỏi này được không?	Can you help me with this question?	A polite help request.
Tôi chưa hiểu phần này	I do not understand this part yet	Use this when details are unclear.
Nói lại giúp tôi được không?	Can you repeat that for me?	Useful when the answer is too fast.
Viết ra giúp tôi được không?	Can you write it down for me?	Helpful for names, prices, and addresses.
Cái này nghĩa là gì?	What does this mean?	Use while pointing at a form, sign, or message.

How to use it in real sentences

Use the examples as sentence patterns, not isolated vocabulary. Say the whole line first, then replace one small part such as the person, time, object, or place.

Substitution drill

Base sentence	Change this	New sentence
Cái này là gì?	change the person or topic	Ở đâu vậy?
Ở đâu vậy?	change the time, place, or object	Khi nào?
Khi nào?	say it as a real request or answer	Tại sao?

Real situation

Use this natural Vietnamese grammar when a real conversation forces you to speak quickly. Pick one sentence from the examples, imagine the situation, then change only one detail so the grammar becomes usable instead of abstract.

Southern Vietnamese note

Southern Vietnamese often prefers practical, context-rich examples. Learn the pattern through a line you might actually say.

Practice drill

1. Read each Vietnamese sentence aloud.
2. Replace one noun or time word.
3. Listen to the slow audio, then say the new sentence twice.
4. Cover the English and recall the Vietnamese from the situation.
5. Save the examples you would actually use this week.

Common mistake

Do not ask unrelated questions; follow the last answer.

Next step

After this page, open the related practice or continue to the next grammar lesson: softening-requests.