Aspect Rather Than Tense

Vietnamese is often described as a "tenseless" language. This means verbs never change form to show time.

Instead of strict past, present, and future tenses, Vietnamese uses time and aspect markers. These are small, optional words placed usually before the verb (though some, like rồi, go at the end) to show how an action unfolds relative to a point in time:

• đã: The action is completed or happened before a reference time. It is often paired with rồi at the end of the sentence (đã ... rồi) to emphasize completion.
• đang: The action is currently ongoing or in progress.
• sẽ: The action is anticipated or expected.
• rồi: The action is already completed (placed at the end of the sentence).
• chưa: The action has not happened yet.
• vừa / mới: The action just happened.
• sắp: The action is about to happen (often paired with rồi at the end: sắp ... rồi).
• từng: The action is a past experience (have ever done). It is often combined with đã as đã từng to emphasize the past experience.

Key Differences from English:

1. They are optional: If you use a time word like "yesterday" or "tomorrow", the timeframe is already clear. Native speakers naturally drop these markers to sound more natural. (Time and aspect markers are optional)

2. They are relative, not absolute: Because they show time and aspect relative to the context, đang can mean "was doing" (past continuous) if the story is set in the past, and đã can mean "will have done" in a future context.

3. Past Negation: Instead of combining đã with a negative word, native speakers typically drop đã and just use không or chưa before the verb. Use không for a flat denial with no expectation of it happening, and chưa when there is an expectation it might happen later. Note that đã không is also fine and common, for example to stress that something did not happen (e.g., "Hôm qua tôi đã không đi học" - Yesterday I did not go to school) or in "if" sentences (e.g., "Nếu tôi biết, tôi đã không làm" - If I had known, I wouldn't have done it). Never put đã before chưa in a statement. However, unlike đã, you do keep sẽ and đang when negating them (e.g., sẽ không, đang không).

4. Asking Questions: To ask if an action has happened yet, use the pattern đã ... chưa? (or just ... chưa?). Notice that while chưa goes before the verb in negative statements (e.g., chưa ăn - haven't eaten), it goes at the end of the clause in questions (e.g., ăn chưa? - eaten yet?).

5. Combining markers: Markers can be stacked for nuance, such as vừa mới (only just) or đang ... rồi.