Two people can truthfully give a negative answer about reading a book while saying different things. One does not read that book. The other has not read it yet. English sometimes hides the distinction inside “No.” Vietnamese lets the distinction appear in a short reply, which makes it worth learning as a conversation pattern rather than a vocabulary list.

Không commonly negates the predicate. Chưa says the relevant event or state has not happened by the reference point. Rồi, in the sentence-final patterns here, marks a reached state or an already-realized event. It does not simply mean “past”: a situation that has now changed can matter to the present conversation.

These are general Vietnamese constructions. All examples are original learning examples about fictional adult peers, using tôi for “I” and bạn for the person addressed. Actual address terms depend on the relationship.

The question tells you which distinction is live

Compare these constructed pairs:

Bạn có đọc sách không? Do you read books?

Tôi không đọc sách. I do not read books.

Now change the question:

Bạn đọc cuốn sách này chưa? Have you read this book yet?

Tôi chưa đọc. I have not read it yet.

The first pair is about whether reading books is part of the person’s activity or habit. The second puts a particular book on a before/after boundary. The negative reply fits the question’s boundary instead of merely rejecting its wording.

NIU’s Lesson 8 grammar sets out chưa questions and the corresponding rồi/chưa answers. MSU’s explanation places chưa before the predicate and rồi at the end of an affirmative reached-state clause.

An original three-state reading strip

Use this textual timeline for one particular book:

  1. Before reading it: Tôi chưa đọc cuốn sách này. I have not read this book yet.
  2. During the reading: Tôi đang đọc cuốn sách này. I am reading this book.
  3. After completing it: Tôi đọc xong cuốn sách này rồi. I have finished reading this book.

The middle line uses đang to make the ongoing activity explicit. The final line includes xong (“finished”), because Tôi đọc cuốn sách này rồi can report that the reading has happened without giving the exercise’s exact completion boundary as clearly. TUFS distinguishes postverbal completion with xong.

This is why the object and the task matter. Reading a page, opening a book and finishing a book are different milestones. A learner who hears rồi should identify which milestone the speaker is reporting.

“Not yet” leaves a boundary open

Tôi chưa hiểu means “I do not understand yet.” Tôi không hiểu means “I do not understand.” Both may describe the same present difficulty, but chưa places it on a progression toward understanding. It does not promise that understanding will arrive, or give the other person permission to assume it has.

Likewise, Tôi chưa đi (“I have not gone yet”) is not a firm statement that you will go later. If the plan itself matters, add an explicit statement about it. The temporal opening in chưa is useful information; it is not a commitment.

Twelve replies: keep the fact, change the framing

For each prompt, pick the reply that says exactly what the description supplies. The situations are constructed; no social scene or native-speaker test is being reported.

  1. Asked whether you read books, you mean a general “I don’t.” Không đọc / Chưa đọc?
  2. Asked whether you have read a particular book, you have not started it. Chưa đọc / Đọc rồi?
  3. Asked whether you have finished a page, you have finished it. Xong rồi / Chưa xong?
  4. Asked whether you have finished a page, you are halfway through. Chưa xong / Xong rồi?
  5. Asked whether you understand an explanation, you want to say “not yet.” Chưa hiểu / Hiểu rồi?
  6. Asked whether you understand an explanation, the point is now clear. Hiểu rồi / Chưa hiểu?
  7. Asked whether you have a dictionary, you have none. Không có / Có rồi?
  8. Asked whether you have obtained the dictionary yet, you are still waiting. Chưa có / Có rồi?
  9. Asked whether you have obtained it yet, it is now on your desk. Có rồi / Chưa có?
  10. Asked whether you go to that club, you want to deny the habit. Không đi / Đi rồi?
  11. Asked whether you have sent a low-stakes greeting message, you have not sent it. Chưa gửi / Gửi rồi?
  12. Asked whether you have sent it, the send has happened. Gửi rồi / Chưa gửi?

Answer key with the reason

  1. Không đọc: general negation.
  2. Chưa đọc: the particular reading has not happened yet.
  3. Xong rồi: the named completion boundary is reached.
  4. Chưa xong: halfway is ongoing, not complete.
  5. Chưa hiểu: understanding has not been reached.
  6. Hiểu rồi: understanding is now established.
  7. Không có: absence of possession.
  8. Chưa có: acquisition has not happened by now.
  9. Có rồi: possession is now established.
  10. Không đi: denies the activity/habit.
  11. Chưa gửi: the sending milestone is unreached.
  12. Gửi rồi: the sending milestone is reached.

Short replies omit material already clear from the question. If there is any uncertainty about the object, restore it: Tôi chưa gửi tin nhắn (“I haven’t sent the message yet”). Practicing that full version helps you hear what the short answer has left unstated.