Sắp + predicate presents a situation as imminent: Trời sắp mưa “It is about to rain.” The event is viewed from just before a relevant boundary, with evidence or expectations making it feel close. Sắp is therefore narrower than a general future expression such as sẽ.
The form is standard and extremely common in (informal) speech as well as neutral writing. It is not a future-tense conjugation: what counts as “close” depends on the event, the speaker's expectations, and the context. The expanded sắp sửa, which is comparatively more deliberate and common in (formal) or written announcements, has its own treatment on Sắp Sửa and Formal Imminence.
The basic construction
The neutral order is:
subject + sắp + predicate
Xe buýt sắp đến rồi, chạy ra trạm đi!
The bus is about to arrive—run out to the stop!
Tôi sắp hết pin nên có thể cuộc gọi sẽ bị ngắt.
My battery is about to run out, so the call may get cut off.
Bọn trẻ sắp ngủ; nói nhỏ thôi.
The children are about to go to sleep; keep your voice down.
Sắp scopes over the following predicate: sắp hết pin means the battery is near the endpoint of being depleted, while sắp gọi cho Mai means the act of calling Mai is near its beginning. The lexical shape of the event determines which boundary is relevant.
Sắp versus sẽ
Sẽ projects an event; sắp says that its realization is close. A plan for next year can use sẽ without being sắp.
Năm sau chúng tôi sẽ chuyển nhà.
Next year we will move house.
Đóng nốt cái thùng này đi; chúng ta sắp chuyển nhà rồi.
Finish packing this box; we're about to move house.
The second sentence supplies signs of an approaching transition. Rồi often follows an imminent clause in conversation—sắp ... rồi—to emphasize that circumstances have now advanced to this near-boundary stage. It does not mean the projected event is already completed.
Nhanh lên, phim sắp bắt đầu rồi!
Hurry up, the film is about to start!
This combination is not contradictory. Sắp says the start has not yet occurred; rồi presents “being close to the start” as a new current situation.
Event type changes the relevant boundary
With a punctual event, sắp points to its imminent occurrence: sắp nổ “about to explode.” With an activity, it points to onset: sắp chạy “about to run/set off.” With an accomplishment, it can point to onset or completion according to the predicate and context.
Tôi sắp đọc cuốn sách này.
I'm about to read this book.
Tôi sắp đọc xong cuốn sách này.
I'm about to finish reading this book.
The result complement xong moves the relevant boundary from starting the reading to completing it. With states, sắp normally implies an impending change into that state.
Sau ba đêm thức trắng, tôi sắp kiệt sức rồi.
After three sleepless nights, I'm close to exhaustion.
Because kiệt sức is a state, the sentence means the speaker is approaching the threshold at which that state holds.
Time adverbials and relative closeness
An explicit time phrase can coexist with sắp if it supports a contextually close horizon.
Trường sắp nghỉ hè rồi, chỉ còn hai tuần nữa thôi.
The school is about to break for summer—there are only two weeks left.
In natural discourse, the speaker treats two weeks as close for planning a school term. For a two-minute event, two weeks would not normally count as imminent. This relativity is why sắp cannot be reduced to a fixed number of minutes or days.
In a past narrative, sắp can be relative to a past reference point.
Khi chúng tôi đến ga, tàu sắp chạy nên ai cũng vội.
When we reached the station, the train was about to leave, so everyone hurried.
English uses was about to. Vietnamese does not alter sắp: khi chúng tôi đến ga establishes the past viewpoint.
Decision aid: which viewpoint do you need?
| Form | Viewpoint | Boundary status |
|---|---|---|
| đã ăn | eating already realized | before reference point |
| đang ăn | eating in progress | inside event |
| sẽ ăn | eating projected | future, not necessarily close |
| ăn rồi | completion or changed situation | after relevant boundary |
| từng đi | going as prior experience | at least once before |
| mới đến / vừa đến | arrival is recent | just after boundary |
| chưa xong | completion not reached | before endpoint |
| sắp mưa | rain is imminent | just before onset |
| vẫn chờ | waiting persists | continuing |
Choose sắp when nearness to the boundary is part of the message. Choose sẽ for a neutral prediction or plan. Choose bắt đầu once the onset is reached, and mới/vừa when looking back just after it.
Negation and warnings
Vietnamese generally avoids using không sắp V as a routine equivalent of English “isn't about to V.” It is possible as metalinguistic contrast—rejecting somebody's claim of imminence—but ordinary negative predictions use sẽ không V, while absence of immediate intention is expressed lexically.
Tôi sẽ không nghỉ việc; tin đồn đó không đúng.
I will not quit my job; that rumor isn't true.
Tôi chưa định nghỉ việc.
I have no intention of quitting my job yet.
This is an area where there is no one-to-one English substitution. Select the intended meaning: negative future, no present plan, or explicit denial that something is imminent.
A dialogue where sắp changes the action
— Cậu ăn chưa? — Chưa, tớ sắp ăn đây. — Thế tớ chờ nhé? — Ừ, đồ ăn vừa giao đến, tớ đang dọn ra bàn.
— Have you eaten? — Not yet, I'm just about to. — Shall I wait, then? — Yes, the food has just arrived and I'm putting it on the table.
Chưa says the eating boundary has not been crossed. Sắp ăn đây presents it as immediately upcoming, with đây giving the (informal) sense “right now / here I go.” Vừa giao đến locates a recent arrival, and đang dọn presents preparation in progress. A bare sẽ ăn would merely promise future eating and would not justify the same expectation of immediacy.
Common Mistakes
1. Using sắp for every English future. A distant plan is not automatically imminent.
❌ Mười năm nữa tôi sắp nghỉ hưu.
Odd without a special ten-year planning horizon—sắp presents retirement as close.
✅ Mười năm nữa tôi sẽ nghỉ hưu.
I will retire in ten years.
2. Adding đã merely to force a past reading. A past frame can locate sắp by itself. The sequence đã sắp is possible when đã genuinely contributes “already”—for example, Tết đã sắp đến rồi “Tết is already drawing near”—but it is not a past-tense form of sắp.
❌ Hôm qua trời đã sắp đã mưa.
Incorrect—stacking đã around sắp does not create an English-style past form.
✅ Hôm qua, lúc chúng tôi ra khỏi nhà, trời sắp mưa.
Yesterday, when we left the house, it was about to rain.
3. Treating rồi as an English perfect marker. In sắp ... rồi, it marks a changed current situation, not completion of V.
❌ Tàu sắp chạy rồi nghĩa là tàu đã chạy.
Incorrect—the train has not left yet.
✅ Tàu sắp chạy rồi; lên ngay đi!
The train is about to leave; get on now!
4. Keeping sắp after the onset has occurred. Move to bắt đầu or đang.
❌ Mưa đã rơi được mười phút mà trời vẫn sắp mưa.
Contradictory for one rain event—it has already begun.
✅ Trời mưa được mười phút rồi.
It has been raining for ten minutes.
Key Takeaways
- Sắp + predicate places the viewpoint just before a contextually close boundary.
- Sẽ projects; sắp adds imminence; bắt đầu says the onset is reached.
- Event structure determines whether the relevant boundary is an onset or an endpoint.
- Sắp ... rồi means that imminence is now salient, not that the event is already complete.
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Start learning Vietnamese →Related Topics
- Bắt Đầu and Ingressive AspectB1 — Use bắt đầu to select the onset of an action, state, or new phase without turning it into a tense form.
- Sắp Sửa and Formal ImminenceB1 — Use sắp sửa for deliberate, often written presentation of an approaching event while recognizing its overlap with ordinary sắp.
- Sẽ and Prospective or Predicted EventsA2 — Use sẽ to present an event as projected or predicted while recognizing that Vietnamese future reference is often unmarked.
- Lexical Aspect: States, Activities, Accomplishments, and AchievementsB2 — Analyze how Vietnamese states, activities, accomplishments, and achievements interact with duration, endpoints, and aspect markers.