đã vs rồi — Past Tense vs Completion

Quick Answer

[đã is a pre-verbal marker that signals a past action — it tells you when something happened. [rồi is a post-verbal completion marker meaning "already" — it tells you that an action is finished or a state has changed. While they often overlap in meaning, their positions in the sentence and their emphasis are different.

Think of đã as the Vietnamese simple past tense, and rồi as a particle meaning "already done." They can also be combined — đã ... rồi — to strongly emphasize that something has already been completed.

Comparison Table

Detailed Explanation

When to use đã

đã (Hán-Việt: 已) is placed directly before a verb to mark that the action took place in the past. For learners who know Chinese, it is closely related to 已經 (yǐjīng, "already/have already"). For Japanese learners, it functions similarly to the plain past form ～た in terms of marking a completed past event.

Use đã when stating neutral facts about the past, narrating events in a sequence, or providing background context. It does not inherently emphasize that the result is still relevant now — it simply marks the action as past.

Important regional note: In Northern Vietnamese, đã is very common in everyday speech. In Southern Vietnamese, speakers often drop đã and rely on time words like hôm qua (yesterday) or năm ngoái (last year) to signal the past instead.

When to use rồi

rồi is placed after a verb or at the end of a sentence to indicate that an action is completed or that a change of state has just occurred. It corresponds closely to "already" in English, or to the Chinese particle 了 (le) placed at the end of a sentence.

Use rồi when you want to reassure someone that something is taken care of, when answering "have you done X yet?" questions affirmatively, or when expressing a sudden change ("I get it now!", "It's broken!"). In Southern Vietnamese, rồi is extremely frequent and often replaces đã in casual speech.

Using đã and rồi together

The combination đã + verb + rồi is the most emphatic way to say "have already done" in Vietnamese. It layers the past marker with the completion marker for extra force — often used when someone is pestering you about whether you did something.

Example Pairs

1. Eating

2. Going home

3. Sleeping

4. Understanding something

5. Doing homework

6. Buying tickets

7. Reading a book

8. Emphatic completion: đã + verb + rồi

Common Patterns

Common Mistakes

Mistake 1 — Putting rồi before the verb

Learners who know that rồi means "already" sometimes place it before the verb, just as English says "I already ate." In Vietnamese, however, rồi must come after the verb or at the end of the sentence.

❌ Tôi rồi ăn cơm.

✅ Tôi ăn cơm rồi.

Vietnamese word order for completion is Subject + Verb + Object + rồi. Never place rồi between the subject and the verb.

Mistake 2 — Putting đã after the verb

Unlike rồi, đã must always come directly before the verb. Some learners confuse the two and place đã at the end of the sentence as if it were rồi.

❌ Tôi ăn cơm đã.

✅ Tôi đã ăn cơm.

The rule is simple: đã goes before the verb, rồi goes after. If you want maximum emphasis, combine them: Tôi đã ăn cơm rồi.

Mistake 3 — Using đã alone to answer a "have you ... yet?" question

When someone asks "Bạn đã ... chưa?" (Have you ... yet?), the natural affirmative answer uses rồi. Using đã alone as a reply sounds incomplete and unnatural to native speakers.

❌ Bạn đã ăn sáng chưa? — Tôi đã.

✅ Bạn đã ăn sáng chưa? — Ăn rồi. / Tôi ăn rồi rồi.

Think of it as a fixed pair: đã...chưa? is always answered with rồi for yes and chưa for no. This is one of the most common exchanges in everyday Vietnamese.

Mistake 4 — Using rồi for actions that have not yet happened

Because rồi signals completion or a state that is already true, it cannot be used for future actions. Learners sometimes attach rồi to future statements, hoping it adds the sense of "will have done."

❌ Ngày mai tôi học rồi. (intending: Tomorrow I will study)

✅ Ngày mai tôi sẽ học. (Tomorrow I will study.)

rồi marks something as already done or already the case right now. For future actions, use sẽ or simply combine a future time word with the verb.

Mistake 5 — Using đã instead of rồi for a change of state

When something has just changed — a sudden realization, a light turning on, a door closing — rồi captures this "change of state" meaning naturally. đã does not carry this nuance and sounds flat in these contexts.

❌ Tôi đã hiểu! (when exclaiming "I finally get it now!")

✅ Tôi hiểu rồi! (I get it now! — the moment of understanding)

For change-of-state exclamations (sudden realizations, things that just became true), rồi is the natural and idiomatic choice. đã would imply you understood it at some point in the past, not right now.

Related Grammar Points

• bao nhiêu vs mấy — How Many (Large vs Small) (Comparison A1)
• là vs Zero Copula — When to Use 'là' (Comparison A1)
• không vs chưa — Two Types of Negation (Comparison A1)
• có...không vs ...chưa — State vs Completion Questions (Comparison A1)
• cái vs con — Object vs Animal Classifiers (Comparison A1)
• gì vs nào — What vs Which (Comparison A1)

Quick Quiz

Fill in the blank with đã or rồi:

Question 1: Hôm qua, anh ấy _____ gọi điện cho tôi. (Yesterday, he called me.)

Hint: This is a neutral statement about a past event that happened yesterday. You are simply reporting what occurred.

Fill in the blank with đã or rồi:

Question 2: Bạn đã ăn sáng chưa? — Ăn _____. (Have you had breakfast? — Yes, already.)

Hint: This is an affirmative reply to a "have you ... yet?" question. Think about which word always pairs with this type of question as the "yes" answer.

Fill in the blank with đã or rồi:

Question 3: Đừng lo, tôi đặt bàn _____. (Don't worry, I've already made a reservation.)

Hint: The speaker wants to reassure someone that the action is completely taken care of. Which word emphasizes that something is done and finished?