Vietnamese nghĩ covers several kinds of thinking: holding an opinion, actively considering a question, thinking about someone, producing an idea, and—within the right frame—contemplating an intended action. It does not have conjugated forms corresponding to English think, thought, and will think. Vietnamese keeps nghĩ stable and builds the intended meaning with complements, particles, aspect markers, and discourse context.
That construction map matters because English “think of,” “think about,” “think that,” and “think someone is...” do not transfer word for word. This page stays with nghĩ; nhớ “remember/miss” is treated separately.
Choose the frame before translating
| Frame | Usual meaning | Example |
|---|---|---|
| nghĩ (rằng/là) + clause | think, believe, hold an opinion | nghĩ là họ sẽ đến |
| nghĩ về + topic/person | think about, reflect on | nghĩ về tương lai |
| nghĩ đến/tới + referent | think of; bring to mind; consider consequences | nghĩ đến gia đình |
| nghĩ + question word/noun | work out or consider something | nghĩ cách giải quyết |
| nghĩ ra | come up with, think of an answer/idea | nghĩ ra một cái tên |
| nghĩ lại / nghĩ kỹ | reconsider / think carefully | nghĩ lại quyết định |
Opinions and propositions
For an opinion or prediction, nghĩ + clause is common in conversation. Nghĩ là is especially frequent in speech, while nghĩ rằng is neutral to formal and common in careful writing. The complement can also be omitted when it is recoverable from the previous turn.
Tôi nghĩ ngày mai trời sẽ bớt mưa.
I think it will rain less tomorrow.
Nhiều chuyên gia nghĩ rằng thị trường cần thêm thời gian để phục hồi.
Many experts think that the market needs more time to recover. (formal/neutral)
— Anh ấy có đồng ý không? — Tôi nghĩ là có.
— Will he agree? — I think so.
In negative clauses, tôi không nghĩ... often has scope over the following proposition, much like “I don't think...” in English. Tôi nghĩ...không... can instead place the negation inside the proposition. The two may describe similar situations, but their stance differs.
Tôi không nghĩ họ kịp chuyến tàu cuối.
I don't think they'll make the last train.
Tôi nghĩ họ không kịp chuyến tàu cuối đâu.
I think they won't make the last train.
With a person and a property, Vietnamese normally uses a clause: Tôi nghĩ anh ấy rất tận tâm or Tôi cho rằng anh ấy rất tận tâm. It does not use an English-style object-plus-adjective frame such as think him dedicated.
Nghĩ về and nghĩ đến/tới
Nghĩ về + topic presents a topic as the object of sustained reflection. Nghĩ đến or nghĩ tới often means that a person, possibility, or consequence enters the mind. The distinction is a useful tendency, not an absolute wall: both can translate “think about,” and context affects the choice.
Dạo này tôi hay nghĩ về việc chuyển về sống gần bố mẹ.
Lately I've often been thinking about moving back to live near my parents.
Nghe bài hát đó là tôi lại nghĩ đến mùa hè năm ấy.
Whenever I hear that song, I think of that summer.
Trước khi đăng ảnh của người khác, hãy nghĩ đến quyền riêng tư của họ.
Before posting someone else's photo, consider their privacy.
Nghĩ cho appears in expressions such as nghĩ cho người khác “be considerate of others.” Here cho is benefactive: the thinking takes another person's interests into account. Chỉ nghĩ cho mình criticizes selfishness.
Em cũng nên nghĩ cho sức khỏe của mình, đừng làm việc suốt đêm.
You should also think of your own health; don't work all night.
Active thought, questions, and solutions
When nghĩ names an active mental process, it can stand alone or take a question word, a noun such as cách “way,” or a clause. Đang nghĩ is natural here because the thinking is an ongoing activity, unlike a settled opinion.
Đợi một chút, tôi đang nghĩ xem nên trả lời thế nào.
Wait a moment, I'm thinking about how to answer.
Cả nhóm phải nghĩ cách giảm chi phí mà không giảm chất lượng.
The whole team has to think of a way to cut costs without reducing quality.
Nghĩ ra marks a successful mental result: an idea, solution, name, or excuse has been produced. Nghĩ được can emphasize managing to think of something. The combination nghĩ ra được is also possible when both the result and the difficulty of achieving it matter.
Cuối cùng bé cũng nghĩ ra một cái tên cho chú mèo mới.
The child finally came up with a name for the new cat.
Tôi chưa nghĩ được cách nào vừa nhanh vừa an toàn.
I haven't managed to think of a way that is both fast and safe.
Reconsidering and forming intentions
Nghĩ lại has two important readings. It can mean think again/reconsider, or look back on something in memory. Nghĩ kỹ means think carefully. In an imperative, nghĩ kỹ đi can be advice or a warning depending on tone.
Tôi đã định từ chối, nhưng nghĩ lại thì đây là một cơ hội hiếm có.
I was going to refuse, but on second thought this is a rare opportunity.
Anh cứ nghĩ kỹ rồi mai trả lời cũng được.
Take your time to think it over; you can answer tomorrow.
English also uses “think” for intention: “I'm thinking of applying.” Vietnamese may use đang nghĩ đến chuyện nộp đơn when the idea is under consideration. Once the speaker has an actual plan, định is usually clearer: Tôi định nộp đơn tuần sau. Tôi nghĩ sẽ... can present a tentative decision or prediction about one's own action, but it is softer and more stance-based than a firm định.
Tôi đang nghĩ đến chuyện học thêm vào buổi tối, nhưng chưa quyết định.
I'm thinking of studying more in the evenings, but I haven't decided.
Tôi nghĩ cuối tuần này sẽ ở nhà nghỉ ngơi.
I think I'll stay home and rest this weekend. (tentative decision)
Tôi định đăng ký khóa học trước thứ Sáu.
I intend to register for the course before Friday. (clear plan)
Do not make nghĩ + infinitive a universal equivalent of English “intend to.” Vietnamese has no infinitive marker here, and a bare second verb can be misread as a clause or unnatural compression. Choose định, nghĩ đến chuyện + VP, or nghĩ là sẽ + VP according to certainty and structure.
Aspect and useful collocations
Đã nghĩ locates an act of thought before the reference point; đã nghĩ ra adds a successful result. Chưa nghĩ đến means something has not yet been considered. Từng nghĩ means “once thought/used to think,” and often introduces a belief that later changed.
Tôi từng nghĩ làm việc ở nhà sẽ dễ hơn, nhưng thực tế không phải vậy.
I once thought working from home would be easier, but that isn't actually the case.
Other common combinations include suy nghĩ “think/reflect” (often more deliberate), nghĩ ngợi “brood/think things over” (often prolonged or worried), and nghĩ bụng “think to oneself,” which is common in narrative and somewhat literary. Nghĩ sao nói vậy is an idiom meaning to say exactly what one thinks, sometimes without tact.
Cậu ấy nghĩ sao nói vậy nên đôi khi làm người khác chạnh lòng.
He says exactly what he thinks, so sometimes he hurts other people's feelings.
A five-way reference set
| Function | Vietnamese | Interpretation |
|---|---|---|
| affirmative | Tôi nghĩ phương án này khả thi. | I think this option is feasible. |
| negative | Tôi không nghĩ anh ấy cố ý. | I don't think he did it deliberately. |
| question | Bạn nghĩ sao về đề xuất này? | What do you think of this proposal? |
| aspect-marked | Tôi chưa từng nghĩ đến khả năng đó. | I have never considered that possibility. |
| idiomatic collocation | Cô ấy nghĩ sao nói vậy. | She says exactly what she thinks. |
The complement changes the kind of thought
— Cậu nghĩ gì về công việc mới? — Tớ nghĩ là công việc khá hợp với mình, nhưng đang nghĩ đến chuyện chuyển nhà. Tớ phải nghĩ kỹ đã.
— What do you think about the new job? — I think the job suits me quite well, but I'm considering moving. I need to think it over first.
The question's nghĩ gì về requests an evaluation. Nghĩ là introduces an opinion. Nghĩ đến chuyện presents a possible action under consideration, and nghĩ kỹ delays commitment until reflection is complete. Translating each one merely as “think” hides the grammatical work done by the complements.
Common Mistakes
1. Adding về before a clause of opinion. Về introduces a topic noun, not the truth-valued content after “I think that.”
❌ Tôi nghĩ về ngày mai họ sẽ đến.
Incorrect for ‘I think they will come tomorrow’—về wrongly turns the following material into a topic phrase.
✅ Tôi nghĩ ngày mai họ sẽ đến.
I think they will come tomorrow.
2. Copying an English object-complement frame. Vietnamese uses a full predication after nghĩ, not a person followed directly by a noun phrase.
❌ Tôi nghĩ anh ấy một người thông minh.
Incorrect—Vietnamese does not build the English object-complement frame this way.
✅ Tôi nghĩ anh ấy là một người thông minh.
I think he is an intelligent person.
3. Using nghĩ alone for a firm intention. When a settled plan is meant, định is the direct choice.
❌ Tôi nghĩ nộp đơn vào thứ Hai.
Unclear and unnatural for ‘I intend to submit the application on Monday.’
✅ Tôi định nộp đơn vào thứ Hai.
I intend to submit the application on Monday.
4. Confusing nghĩ ra with nghĩ về. The first reaches a mental result; the second establishes a topic.
❌ Tôi nghĩ về một giải pháp rồi!
Wrong if the intended meaning is ‘I've come up with a solution!’—this only says the solution is the topic of thought.
✅ Tôi nghĩ ra một giải pháp rồi!
I've come up with a solution!
Key Takeaways
- Use a bare clause, là, or more formal rằng to state what someone thinks.
- Nghĩ về frames a topic; nghĩ đến/tới brings a referent or consequence into consideration.
- Nghĩ ra is successful idea formation, while nghĩ lại and nghĩ kỹ revise or deepen deliberation.
- Use định for a clear intention; nghĩ đến chuyện... presents an option still under consideration.
- Đang nghĩ is natural for active deliberation, while an unmarked nghĩ often states an opinion.
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