Vietnamese often leaves a repeated predicate unspoken when a parallel clause or question makes its content unmistakable: Lan chọn trà, còn Minh thì cà phê “Lan chose tea, while Minh chose coffee”; Lan đọc xong rồi, còn Minh thì chưa “Lan has finished reading, but Minh hasn’t.” The missing material is licensed by structure and discourse, not by a general permission to delete verbs.
Strictly, gapping removes a repeated verbal center from a noninitial coordinated clause while contrasting two or more remnants. Predicate ellipsis uses an expression such as cũng vậy, thì chưa, or a bare polarity/aspect response to stand for a recoverable predicate. Vietnamese descriptions vary in terminology, so the practical question is what remains overt and how the listener reconstructs it. Argument drop based mainly on salience across conversational turns belongs on Argument Drop across Turns.
Gapping in parallel coordination
The clearest gapping pattern contains two parallel clauses. The first supplies the predicate; the second retains contrasted participants or objects.
Lan gọi món bún bò, còn Minh thì món cơm gà.
Lan ordered beef noodle soup, while Minh ordered chicken rice.
Nhóm thiết kế phụ trách giao diện, còn nhóm kỹ thuật thì phần tích hợp dữ liệu.
The design team is responsible for the interface, while the engineering team is responsible for the data-integration part. (formal/workplace)
In both, còn announces a contrasting coordinate and thì marks its topic boundary. The missing predicate is identical enough to recover: gọi in the first, phụ trách in the second. If the second relation differs even slightly, repeat the predicate.
Lan gọi món bún bò, còn Minh mang cơm từ nhà đến.
Lan ordered beef noodle soup, while Minh brought food from home.
Deleting mang would falsely instruct the listener to recover gọi. Ellipsis saves predictable material; it cannot silently substitute a new semantic relation.
Vietnamese gapping is particularly natural in lists, comparisons, captions, and concise formal prose. In casual speech, speakers may instead repeat the short verb because repetition is not stylistically objectionable.
Predicate ellipsis after polarity and aspect markers
Vietnamese can leave a predicate unspoken after chưa, rồi, có, không, or cũng, provided the question or preceding clause supplies it. These particles retain essential polarity or aspectual meaning.
— Cậu đọc xong báo cáo chưa? — Rồi.
— Have you finished reading the report? — Yes, I have.
Tôi đã gửi bản cuối rồi, còn chị Mai thì chưa.
I’ve sent the final version, but Mai hasn’t.
— Anh có tham gia cuộc họp không? — Có, nhưng chỉ dự nửa đầu thôi.
— Are you attending the meeting? — Yes, but only the first half.
Rồi recovers “finished reading the report”; chưa recovers “has not yet sent the final version”; answer có confirms the positive predicate. These are not freestanding tense auxiliaries exactly like English have or do. Their interpretation comes from Vietnamese polarity and aspect plus the salient predicate.
For a whole repeated proposition, cũng vậy or cũng thế is useful:
Lan muốn hoãn chuyến đi, và tôi cũng vậy.
Lan wants to postpone the trip, and so do I.
Nếu bên mua phải báo trước ba ngày thì bên bán cũng thế.
If the buyer must give three days’ notice, the seller must do the same. (formal)
In the first, the understood subject of muốn changes to tôi: “I also want to postpone the trip.” In other contexts cũng vậy can mean that an entire state or manner is similar. State the full predicate when the intended scope is not clear.
Echoing a verb is also normal
Unlike English, which often requires do in short answers, Vietnamese can repeat the lexical predicate or use có/không, depending on the question.
— Cậu thích món này không? — Thích, nhưng không ăn được nhiều.
— Do you like this dish? — Yes, but I can’t eat much of it.
— Cậu có đọc cuốn đó không? — Có đọc, nhưng chỉ đọc hai chương thôi.
— Did you read that book? — I did, but I only read two chapters.
The second answer retains đọc to make the contrast with chỉ đọc hai chương explicit. Ellipsis is therefore optional in many contexts; the best form preserves the intended contrast. There is no Vietnamese dummy verb corresponding mechanically to English do.
The shared word-order baseline
| Form | Analysis | Ellipsis? |
|---|---|---|
| Tôi đọc sách. | neutral SVO | none |
| Cuốn sách này thì tôi đọc rồi. | object topic + complete comment with understood object gap | object is recoverable from the topic |
| Hôm qua tôi mới gặp anh ấy. | time frame + SVO; mới scopes over the event/time | none |
| Ai cũng biết. | universal quantified subject + predicate | object may be supplied by context |
| Lan đọc sách, còn Minh thì báo. | contrasted subject and object remnants | đọc is gapped in the second coordinate |
The topic structure in Cuốn sách này thì tôi đọc rồi is not ordinary coordination gapping: the fronted object licenses an understood object position inside its own comment. Likewise, an implicit object in Ai cũng biết may be pragmatically recovered, but it does not arise from parallel coordination. Similar absences can have different grammatical sources.
What must stay overt
Retain material that carries the contrast. Polarity, aspect, quantity, and focus cannot simply disappear with the repeated verb.
Lan đã đọc xong, còn Minh thì mới đọc được một nửa.
Lan has finished reading, while Minh has only managed to read half.
Tôi chỉ mua một vé, còn Nam thì cả ba vé.
I bought only one ticket, while Nam bought all three.
In the first, the predicates are not identical enough for full gapping: đã...xong contrasts with mới...được một nửa. In the second, the discourse can recover mua, while chỉ một vé contrasts with cả ba vé. Cả must remain because it includes the entire set.
Negation also needs an overt carrier:
Tôi đồng ý, còn chị ấy thì không.
I agree, but she does not.
Bare không negates the recovered predicate đồng ý. English learners sometimes insert làm as if it were dummy do: chị ấy không làm means “she does not do/work [it],” not “she does not agree.”
A dialogue where ellipsis reaches its limit
— Ai duyệt bản tiếng Việt, ai duyệt bản tiếng Anh? — Bản tiếng Việt thì chị Hà duyệt, còn bản tiếng Anh thì anh Nam. — Thế bản phụ lục? — Bản phụ lục thì chị Hà cũng duyệt.
— Who is approving the Vietnamese version, and who is approving the English version? — Hà is approving the Vietnamese version, while Nam is approving the English version. — What about the appendix? — Hà is approving the appendix too.
The first answer uses object topics, with duyệt omitted only from the second balanced comment: the matching structure makes the gap uniquely recoverable. The final answer deliberately repeats duyệt. A reply such as Chị Hà cũng vậy could instead link Hà to Nam’s immediately preceding situation and leave the appendix relation uncertain. Ellipsis depends not just on a word mentioned somewhere in the exchange but on a single, active parallel relation.
Scope and constituent order
Fronting without discourse support does not make ellipsis clearer. Compare:
Cuốn này thì tôi đã đọc, còn cuốn kia thì chưa.
This one I’ve read, but the other one I haven’t.
Both books are established as a contrast set. Thì divides each object topic from its comment, and chưa retains the negative-yet meaning. If the books are new, ordinary SVO is clearer: Tôi đã đọc cuốn này nhưng chưa đọc cuốn kia.
Likewise, Ai cũng biết means “everyone knows,” whereas Ai biết? asks “Who knows?” Cũng belongs to the ai cũng universal construction and cannot be discarded as though it were a repeated predicate.
Register and punctuation
Gapping is neutral in clear conversational contrasts and useful in compact formal comparisons. Very dense gapping can sound bureaucratic or headline-like (formal). Commas, còn, thì, and parallel phrasing help the reader locate the gap. Predicate ellipsis in one-word replies is ordinary (informal/neutral); legal or technical prose usually repeats key predicates to prevent competing recoveries.
Common Mistakes
Inserting làm as English dummy do
❌ Tôi thích món này, còn Lan không làm.
Incorrect for ‘Lan doesn’t’; không làm means ‘doesn’t do/work.’
✅ Tôi thích món này, còn Lan thì không.
I like this dish, but Lan doesn’t.
Bare không can negate the recovered predicate; no dummy verb is required.
Gapping a different verb
❌ Lan mua cà phê, còn Minh thì trà từ nhà mang đến.
Ill-formed packaging—the intended second relation is ‘bring,’ not the recoverable ‘buy.’
✅ Lan mua cà phê, còn Minh thì mang trà từ nhà đến.
Lan bought coffee, while Minh brought tea from home.
Repeat mang because it introduces a different event.
Deleting the particle that carries the contrast
❌ Tôi gửi rồi, còn Mai thì.
Incomplete—the second clause does not express whether Mai sent it.
✅ Tôi gửi rồi, còn Mai thì chưa.
I’ve sent it, but Mai hasn’t yet.
Chưa is the overt negative-aspect remnant that licenses recovery.
Fronting a new object just to imitate English contrast
❌ Một báo cáo mới thì Lan viết, một bảng số liệu thì Minh.
Awkward without an established contrast set; the objects are presented as topics too early.
✅ Lan viết một báo cáo mới, còn Minh thì lập một bảng số liệu.
Lan wrote a new report, while Minh prepared a data table.
The corrected version introduces new information in ordinary order and repeats the different predicate.
Key Takeaways
- Gapping needs parallel coordination and contrasted remnants; predicate ellipsis needs a salient predicate and an overt polarity, aspect, or similarity cue.
- Keep chưa, không, rồi, cũng, chỉ, or cả when that particle carries the intended contrast.
- Vietnamese does not use làm as a general dummy equivalent of English do.
- A fronted topic gap, a contextually omitted object, and coordination gapping may look alike but have different licensing conditions.
- When more than one predicate could be recovered, repeat the predicate.
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