vào

On / in (A Day or Month)

Level 2

Vào is the Vietnamese equivalent of "in," "on," or "at" when talking about calendar time.

How It Works

Use vào before parts of the day, days of the week, weeks, dates, months, seasons, years, and holidays (e.g., vào mùa hè, vào dịp Tết). When referring to dates, the word ngày (day) is usually explicitly stated before the number (e.g., vào ngày 15). For general parts of the day, use buổi (e.g., vào buổi sáng), though it is often dropped in casual speech when attached to a specific day (e.g., vào sáng thứ Hai instead of vào buổi sáng thứ Hai). For "daytime" and "nighttime", use ban instead of buổi (e.g., vào ban ngày, vào ban đêm). For approximations, use vào khoảng (at around).

Clock Time: To express exact clock time, lúc is the primary marker (e.g., lúc 7 giờ). You can optionally add vào to form vào lúc for a slightly more formal tone.

Stacking Time Units: When combining multiple time units, vào usually goes at the very beginning of the entire time phrase (e.g., vào lúc 7 giờ sáng thứ Hai).

When to Drop: In everyday spoken Vietnamese, vào is highly optional and frequently dropped before almost all time markers, including days, dates, months, and years (e.g., Tôi sinh tháng Tư). For standalone relative time words like hôm nay (today), hôm qua (yesterday), or ngày mai (tomorrow), vào is usually omitted in casual speech. However, phrases like vào hôm nay are perfectly grammatical and commonly used in formal contexts, journalism, or news broadcasts. For phrases using này (this), trước (last), and sau (next) (e.g., vào tuần này, vào tháng trước, vào năm sau), using vào is perfectly natural and grammatically correct, though it can still be dropped in casual speech.

Important Distinctions:

  • Not with "now": Using vào before bây giờ (now) sounds unnatural and clunky, often like a direct English translation. To say "at this time" or "at this moment", simply use bây giờ on its own, or say vào lúc này.
  • Vào as a verb or spatial preposition: Note that vào is also a very common verb meaning "to enter" (e.g., đi vào = to go in) or a spatial preposition meaning "into" (e.g., chạy vào nhà = to run into the house). In this pattern, it functions as a preposition of time.
  • Vào and trong can both translate to "in" and are often interchangeable before months and years (e.g., vào tháng Tư or trong tháng Tư). However, trong is also used for durations (trong 5 năm = for 5 years), while vào strictly points to a specific time.
  • Vào is a preposition and can only precede noun phrases. To say "when" before a full subject-verb clause, you must use khi or lúc instead.
  • Not for countdowns: English speakers often misuse vào for countdowns because of the English preposition "in". For countdowns like "in 3 hours" or "in 5 minutes", you must use sau (e.g., sau 3 tiếng, sau 5 phút nữa). Saying vào 3 tiếng is ungrammatical.

Examples (5)

  1. Tôi sinh vào tháng Tư.

    I was born in April.

    Word by Word: I born in month four.

    Used before a month, translating to "in". In casual speech, the word 'vào' can be omitted here.

  2. Chúng tôi thường đi biển vào mùa hè.

    We usually go to the beach in the summer.

    Word by Word: We usually go beach in season summer.

    Used before a season to mark a specific time of year.

  3. Khóa học bắt đầu vào thứ Ba, ngày 19.

    The course begins on Tuesday, the 19th.

    Word by Word: Course begin on Tuesday, day 19.

    Translates to "on" when used before days of the week and specific dates.

  4. Chuyến bay sẽ khởi hành vào lúc 7 giờ sáng.

    The flight will depart at 7 AM.

    Word by Word: Flight will depart at moment 7 hour morning.

    For exact clock times, 'lúc' is the primary marker. Adding 'vào' before 'lúc' is optional and makes the sentence slightly more formal.

  5. Tôi chuyển đến Hà Nội vào năm 2020.

    I moved to Hanoi in 2020.

    Word by Word: I move arrive Hanoi in year 2020.

    Used before a specific year to indicate a milestone in time.

Common Mistakes

  • Using 'vào' for a duration of time instead of a specific point in time.

    Tôi học tiếng Việt vào 5 năm.
    Tôi học tiếng Việt trong 5 năm.

    'Vào' is used to pinpoint a specific time (like 'in 2020' or 'on Monday'). To express a duration or length of time (like 'for 5 years'), you must use 'trong' or được.

  • Using 'vào' before a subject-verb clause.

    Vào tôi đến, trời đang mưa.
    Khi tôi đến, trời đang mưa.

    'Vào' is a preposition and can only attach to noun phrases (like dates or seasons). To say "when [something happened]", you must use khi or lúc before the clause.

How It Connects

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vàoLevel 2On / in (A Day or Month)

Learn This First

To use 'vào' for days and months, you first need to understand the general rules for time phrases in Vietnamese, including their position in a sentence and how dates are formatted. Familiarity with basic prepositions like 'ở' helps in understanding how Vietnamese uses spatial words for temporal concepts.

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