đang ... thì ...

Was Doing When

Level 3

The pattern đang ... thì ... is the standard way to express an interrupted action in Vietnamese. It translates to "was doing [A] when [B] happened."

How It Works

Unlike English, which uses "when" to introduce the interruption, Vietnamese uses thì as a neutral grammatical pivot to connect the background action to the new event. To see the difference, look at the structural contrast:

• English: [Background] + WHEN + [Interruption]
• Vietnamese: (KHI/LÚC) + [Background] + THÌ + [Interruption]

You can optionally start the sentence with khi or lúc (when) to anchor the time clause, but thì (then) is the standard connector before the interruption.

Important Note on Tense: Many learners think đang only means "present continuous." In reality, it is an aspect marker that simply means an action is "in progress." It is perfectly natural to use đang for past events, as the context makes the timeframe clear.

Emphasizing Unfinished Actions: Native speakers frequently add the word dở (unfinished/half-done) right after the background verb (e.g., đang ăn dở thì...) to emphasize that the action was left incomplete because of the interruption.

Suddenness and Subjects: To emphasize the interruption, thì is often followed by adverbs of suddenness like bỗng, bỗng nhiên, or đột nhiên (suddenly). Additionally, the subject of the interrupting action can be the same as the background action, or it can be a completely different subject.

Comparison: Do not confuse this with vừa ... vừa ..., which is used for two parallel, simultaneous actions that do not interrupt each other (e.g., eating while watching TV).

Examples (4)

  1. Tôi đang đi bộ thì trời mưa.

    I was walking when it rained.

    Word by Word: I in-progress walk then sky rain.

    The ongoing action (walking) is interrupted by a sudden event (raining).

  2. Tôi đang ngủ thì anh ấy gọi.

    I was sleeping when he called.

    Word by Word: I in-progress sleep then he call.

    Notice how "thì" is used instead of "khi" to introduce the interruption mid-sentence.

  3. Chúng tôi đang ăn tối thì mất điện.

    We were eating dinner when the power went out.

    Word by Word: We in-progress eat dinner then lose electricity.

    A classic example of a background action being intercepted by an unexpected event.

  4. Người đàn ông đang ngủ thì bị nước văng tung tóe vào mặt.

    The man was sleeping when water splashed onto his face.

    Word by Word: Man in-progress sleep then suffer water splash everywhere into face.

    A more descriptive example showing a sudden, surprising interruption.

Common Mistakes

  • Using 'khi' mid-sentence when 'thì' marks a sudden interruption.

    Different MeaningTôi đang ngủ khi anh ấy gọi.
    Tôi đang ngủ thì anh ấy gọi.

    This sentence is correct and natural. Khi links two things at the same time. Thì in đang ... thì ... highlights that something happened suddenly in the middle of the first action.

  • Stacking tense markers to force a "past continuous" translation.

    Tôi đã đang ngủ thì anh ấy gọi.
    Tôi đang ngủ thì anh ấy gọi.

    đang handles the progressive aspect on its own. You do not need to add đã to show it happened in the past; the context already makes this clear.

How It Connects

Tap a pattern to see what it builds on and what it leads to.

đang ... thì ...Level 3Was Doing When

Learn This First

To understand 'đang ... thì ...', you first need to know how to express ongoing actions using the aspect marker 'đang'. You also need to be familiar with the use of 'thì' as a conjunction that links two clauses, indicating that the second event happens in relation to the first.

Words in This Pattern