Korean polite past tense

01 / Understand

Start with the event and the dictionary stem

A past sentence tells your listener about an earlier event or situation. Begin with a clear time reference such as 어제, meaning yesterday. You can then contrast a routine with one completed occasion: studying Korean in general versus studying Korean yesterday. The time word helps establish the setting, but the verb ending still matters. Simply adding yesterday to an otherwise unchanged present sentence does not give you the ordinary past form practiced here.

Find the stem by removing the final 다 from a dictionary form. 먹다 gives 먹, 가다 gives 가, and 공부하다 gives 공부하. Do not remove an entire syllable just because you recognize part of a word inside it. The stem contains the lexical information that the ending needs. In particular, start from 먹 rather than from the complete polite present form 먹어요. Past tense is not normally made by attaching a past ending after 요.

Korean does not change these past forms according to whether the subject is I, you, or we. Context and the noun or pronoun identify the participant. The listener relationship still matters, which is why this lesson keeps the polite 요 style. That style is useful in many everyday interactions, but it is not a complete replacement for every formal or honorific construction you may eventually need.

02 / Understand

Choose the vowel for regular consonant stems

For many regular stems ending in a consonant, choose 았 when the final stem vowel is ㅏ or ㅗ, and 었 with other vowels. Then add 어요 for the polite form used here. In 먹, the vowel is ㅓ, so the result is 먹었어요. In 받, from 받다, the vowel is ㅏ, so the result is 받았어요. Look inside the final stem syllable for the vowel. Do not choose solely from the final consonant or from the vowel in dictionary 다.

The completed forms contain the past element before the final polite ending. You can see the structure in 받았어요, but you should learn to pronounce it as a complete word. It is not a sequence of disconnected dictionary labels. Consonants link and interact with following vowels according to normal Korean pronunciation. The reading lines are a guide to the complete result, while the Hangul spelling shows the grammatical structure.

Keep the meaning of the verb separate from the choice of ending. Eating, receiving, and reading do not each require a special past tense category. Their stems supply the meaning, and the endings organize the time and speech style. The simple vowel rule is useful for regular forms, but it does not eliminate stem changes. Later in this lesson you will see why knowing the dictionary form and a familiar conjugated form together is helpful.

03 / Understand

Recognize the common vowel contractions

When a stem ends in a vowel, the stem vowel and the following 아 or 어 often combine. The spelling can therefore be shorter than a mechanical sequence of all the pieces suggests. 가다 becomes 갔어요, and 오다 becomes 왔어요. The past element is still present, visible in the final ㅆ inside 갔 or 왔. Do not look for a separate written 었 syllable in every past form.

Other useful patterns include 보다 becoming 봤어요 and 주다 becoming 줬어요. Longer uncontracted forms such as 보았어요 and 주었어요 also exist. In everyday polite conversation, the contracted forms are common. An exercise should not treat a valid uncontracted form as automatically wrong merely because the lesson first presents the shorter form. Here, when a question asks for a contracted form, that requirement is explicit.

The ㅣ vowel often combines with 어 to give 여, as in 마시다 becoming 마셨어요. But not every vowel stem contracts in the same way: 쉬다 gives 쉬었어요. Learn a small group of useful results instead of inventing one universal letter deletion rule. To practice, pair each dictionary form with its past form and say a short sentence. Returning from the complete result to the dictionary form checks that you still recognize which verb you are using.

04 / Understand

Use haesseoyo and past descriptions

The common verb 하다 has the polite past form 했어요. This pattern appears in 공부하다, to study, and 운동하다, to exercise: 공부했어요 and 운동했어요. Treat the final 하다 portion as the part that changes. You do not add a second independent verb meaning did after a complete Korean sentence. In 공부했어요, the form already conveys both the activity and its past presentation.

Korean descriptive predicates also conjugate. A sentence translated with English was does not necessarily need the Korean noun copula. For example, 작다 means to be small, so 작았어요 can describe something as small in the past. 좋다 gives 좋았어요. Adding 이었어요 after an already conjugated adjective would combine structures that do not belong together. First determine whether your dictionary item is a descriptive predicate or a noun.

Some descriptive predicates also end in 하다. Their past form follows the familiar 했어요 pattern even though their English translation may contain was rather than did. The meaning comes from the whole word and its context. This is why translating one English word at a time is unreliable: English was can correspond to a descriptive predicate, an identity expression, or an existence expression. Choose the Korean construction from the intended relationship, then mark it for the earlier situation.

05 / Understand

Say what someone or something was

For a past identity or category expressed by a noun, use 이었어요 after a noun ending in a consonant and 였어요 after a noun ending in a vowel. 학생 ends in a consonant, so 학생이었어요 means was a student. 의사 ends in a vowel, so 의사였어요 means was a doctor. The choice is based on the noun immediately before the ending, not on the person you are describing.

Write the noun and its ending together. In a sentence about yourself, 저는 학생이었어요 presents you as having been a student. The sentence does not specify the exact years or explain whether the identity continued for a while afterward. A fuller conversation supplies the relevant time frame. A past identity statement often contrasts naturally with the present, but the grammar alone does not narrate every later change in the person's life.

To deny a past identity, use 아니었어요 rather than mechanically placing 안 before the positive noun construction. The noun can take 이 or 가 before 아니었어요, as in 학생이 아니었어요. Notice the difference between 이었어요 and 아니었어요: one identifies the past category, and the other denies it. Neither is the general past ending to attach to every action verb. Keep this noun pattern beside, rather than mixed into, the action and description patterns.

06 / Understand

Ask about the past and deny an event

A polite past question can use the same verb form as a statement. 먹었어요. states that someone ate in the relevant context; 먹었어요? asks whether someone ate. Spoken intonation and the surrounding conversation help distinguish them. Written punctuation makes the difference visible. You do not add an English style did at the front, and you do not change the verb for a second person subject.

For a simple negative action sentence, put 안 before the past verb: 안 갔어요 means did not go. With a separable activity noun plus 하다, a useful beginner pattern is 공부 안 했어요. A longer negative uses the stem plus 지 않았어요, as in 가지 않았어요. In that construction, the past marking belongs on the negative predicate. Do not make the common error of retaining the present 않아요 when your intended statement is explicitly about the past.

Both negative patterns can describe the absence of an event. They do not by themselves tell the listener that someone was unable to act. Inability has additional constructions, including 못, introduced in the negative sentences lesson. For a past yes or no question, an answer with the verb is often clearer than a bare yes or no, especially when the question itself is negative. State the event or its absence directly while you are learning.

07 / Understand

Check stem changes and the intended time frame

Some stems change when a vowel ending follows. A familiar example is 춥다, to be cold, which gives 추워요 in the present and 추웠어요 in the past. By contrast, 입다, to wear, keeps its ㅂ in 입었어요. The shared final letter does not guarantee shared behavior. Learn a verb's common conjugated forms with its dictionary form, and check a dictionary or a teaching grammar before applying an irregular pattern to a new word.

Stems ending in ㅡ have another pattern. 쓰다 becomes 썼어요, while 바쁘다 becomes 바빴어요. The final ㅡ drops before the vowel ending, and a preceding stem vowel can affect the result. These examples explain why the short regular rule is a starting framework rather than a rule that produces every word unchanged. You do not need to master all irregular classes to tell a short story about yesterday, but you should avoid presenting an invented form as a predictable exceptionless result.

Finally, Korean past marking and English tense labels do not align perfectly in every expression. Some Korean past forms describe a present resulting state, and a past event can be translated differently depending on the conversation. The exercises here provide ordinary earlier events with clear time settings. Build two factual sentences about a real or imagined yesterday, then ask a partner one question using a form you already know. Check time, stem, contraction, and politeness separately.

Notice the difference

Common mistakes

From understanding to using

Make your own example.

Try these without answer choices. Say your answer aloud or write it below, then compare your reasoning with the model.

Conversation builder

Ask about yesterday

Start by asking what the other person did yesterday. After the activity answer, ask whether the subject studied was Korean, then confirm it.

1. 어제 뭐 했어요?

   Eoje mwo haesseoyo?

   What did you do yesterday?

2. 도서관에서 공부했어요.

   Doseogwaneseo gongbuhaesseoyo.

   I studied at the library.

3. 한국어를 공부했어요?

   Hangugeoreul gongbuhaesseoyo?

   Did you study Korean?

4. 네, 한국어를 공부했어요.

   Ne, hangugeoreul gongbuhaesseoyo.

   Yes, I studied Korean.