Korean Verb Conjugation: 해요, 했어요, and 할 거예요 Explained

The dictionary form is your starting point

Korean dictionaries list verbs and descriptive verbs in a form ending in 다: 가다 (to go), 먹다 (to eat), 읽다 (to read), and 예쁘다 (to be pretty). This is the dictionary form, not normally the form you use in a complete polite sentence. Remove 다 to find the stem: 가-, 먹-, 읽-, and 예쁘-. The stem carries the basic meaning; the ending tells your listener about time, politeness, mood, or connection to another clause.

Korean does not change a verb for the subject in the way English changes be or have. 가요 can mean I go, you go, or they go when the context supplies the subject. Korean also frequently leaves the subject out. The -아요/어요 ending is best introduced as a polite nonpast form: context can make it describe a current action, a routine, or a scheduled event. Learn the whole sentence situation, not an English gloss alone.

매일 한국어를 공부해요.

Maeil hangugeoreul gongbuhaeyo. — I study Korean every day.

공부하다 is listed with 다, but the everyday polite form is 공부해요.

오늘 뭐 해요?

Oneul mwo haeyo? — What are you doing today?

The subject is omitted; context can make it you or someone else.

• Dictionary form: 먹다; stem: 먹-.
• Keep the stem and replace 다 with a suitable ending.
• A Korean sentence can omit its subject when it is understood.

The polite present: 아요 and 어요

For the 해요체 polite style, look at the last vowel in the stem. A stem whose final vowel is ㅏ or ㅗ generally takes 아요; other vowels generally take 어요. 가다 becomes 가요 because 가 already ends in the ㅏ sound, and 먹다 becomes 먹어요. 마시다 becomes 마셔요. This rule describes the underlying combination, but Korean spelling contracts common vowel sequences, so learners should recognize both the rule and the result heard in real speech.

하다 is the high-frequency special case: 하다 becomes 해요, and 공부하다 becomes 공부해요. 오다 combines 오 + 아요 as 와요, and 보다 combines 보 + 아요 as 봐요. These contractions are standard spelling, not casual shortcuts. The polite ending is suitable in many ordinary conversations, but it does not automatically mean a statement is distant or formal; relationship and setting decide that.

친구를 만나요.

Chingureul mannayo. — I meet a friend.

만나다 has the ㅏ vowel, so 만나요 is used.

물을 마셔요.

Mureul masyeoyo. — I drink water.

마시다 becomes 마셔요 after the usual contraction.

주말에 집에 와요.

Jumare jibe wayo. — I come home on the weekend.

오다 plus 아요 contracts to 와요.

• Final ㅏ or ㅗ: usually 아요; otherwise: usually 어요.
• 하다 becomes 해요, not 하요.
• Contractions such as 와요 and 봐요 are standard forms.

Past time: 았어요, 었어요, and 했어요

The polite past uses the same vowel choice as the present, followed by 었어요 or 았어요. 가다 becomes 갔어요, 먹다 becomes 먹었어요, and 마시다 becomes 마셨어요. 하다 becomes 했어요. The written forms contain a contraction: 가 + 았어요 becomes 갔어요, and 하 + 였어요 is conventionally written 했어요. Because these forms are frequent, notice the final syllable rather than trying to pronounce every historical piece separately.

Past marking places an event before the relevant reference time, but English translations can hide the difference. 어제 영화 봤어요 means I watched a movie yesterday. In a story, 갔어요 can move the narrative forward; in a question such as 먹었어요?, it can ask whether someone has eaten, not merely test a finished event. Time words and discourse context matter. Do not assume one Korean tense maps to only one English tense.

어제 책을 읽었어요.

Eoje chaegeul ilgeosseoyo. — I read a book yesterday.

읽다 has ㅓ as the relevant stem vowel, giving 읽었어요.

주말에 영화를 봤어요.

Jumare yeonghwareul bwasseoyo. — I watched a movie on the weekend.

보다 becomes 봐요 in the present and 봤어요 in the past.

아침 먹었어요?

Achim meogeosseoyo? — Did you eat breakfast?

Korean commonly omits the subject and the object may be understood.

• ㅏ or ㅗ stems generally use 았어요; other vowels use 었어요.
• 하다 becomes 했어요.
• Use time words and context to interpret the English tense.

Plans and predictions with -(으)ㄹ 거예요

A common polite way to express a plan, intention, or expectation is -(으)ㄹ 거예요. Attach ㄹ 거예요 after a vowel-ending stem: 가다 becomes 갈 거예요. After a consonant-ending stem, attach 을 거예요: 먹다 becomes 먹을 거예요 and 읽다 becomes 읽을 거예요. A stem ending in ㄹ uses 거예요 without another 을: 살다 becomes 살 거예요. The separate-looking 거예요 is normally written with a space after the verb form.

This construction is not a mechanical equivalent of will. With a first-person subject it often describes a decision or plan, while with a third-person subject it can be a prediction or an inference. 오늘 비가 올 거예요 may mean It will probably rain today. A schedule can instead use a present form: 기차가 3시에 와요, The train comes at three. Choose the form that reflects certainty, intention, and context.

내일 한국어를 공부할 거예요.

Naeil hangugeoreul gongbuhal geoyeyo. — I will study Korean tomorrow.

The 하- stem ends in a vowel, so 공부하다 becomes 공부할 거예요.

저녁에 밥을 먹을 거예요.

Jeonyeoge babeul meogeul geoyeyo. — I am going to eat dinner.

먹- ends in a consonant, so 을 is added.

주말에는 집에서 쉴 거예요.

Jumareneun jibeseo swil geoyeyo. — I will rest at home over the weekend.

쉬다 has a vowel-ending stem, so it becomes 쉴 거예요.

• Vowel-ending stem: ㄹ 거예요; consonant-ending stem: 을 거예요.
• A final ㄹ stem usually takes 거예요 directly: 살 거예요.
• The form can express a plan, prediction, or expectation.

Negation: 안 and 못 are not interchangeable

Place 안 before a verb to express ordinary negation: 안 가요 means do not go or am not going, and 안 먹었어요 means did not eat. The longer pattern -지 않다 has the same broad negative meaning and can be useful in writing or when the speaker wants a fuller form: 가지 않아요. With 하다 compounds, 안 usually comes before the noun plus 하다: 운동을 안 해요, I do not exercise. Some verbs have fixed spacing and lexical habits, so imitate reliable examples rather than applying one visual rule everywhere.

못 means cannot or was unable to, usually because of ability, circumstances, or permission. 못 가요 can mean I cannot go, whereas 안 가요 states that I do not go or will not go without explaining why. This is a difference in the speaker's claim, not simply a softer form of 안. In a past sentence, 못 갔어요 reports inability on that occasion. For deliberate refusal, 안 may be more accurate; for a blocked opportunity, 못 is usually the better choice.

오늘은 안 만나요.

Oneureun an mannayo. — We are not meeting today.

The sentence does not itself say whether the choice is voluntary.

감기에 걸려서 학교에 못 갔어요.

Gamgie geollyeoseo hakgyoe mot gasseoyo. — I could not go to school because I caught a cold.

못 matches an external reason that prevented going.

매운 음식을 못 먹어요.

Maeun eumsigeul mot meogeoyo. — I cannot eat spicy food.

This may describe tolerance or ability, not a temporary refusal.

• 안: ordinary not doing or choosing not to do.
• 못: inability or an obstacle prevents the action.
• Use -지 않다 as another common negative pattern.

Selected irregular patterns: learn the trigger

Some stems change their final consonant when a vowel-initial ending follows. In the ㄷ pattern, 듣다 becomes 들어요 and 걷다 becomes 걸어요, but 받다 stays 받아요; irregularity is lexical, not a promise that every ㄷ verb changes. In the ㅂ pattern, 춥다 becomes 추워요 and 어렵다 becomes 어려워요. The same family can have regular members, so check a dictionary when a new word matters. The goal is to recognize a productive-looking pattern while accepting that vocabulary decides membership.

르 verbs often add an extra ㄹ and change the vowel before it: 모르다 becomes 몰라요 and 빠르다 becomes 빨라요. Some ㅅ verbs lose ㅅ before a vowel: 짓다 becomes 지어요 and 낫다 becomes 나아요, while 웃다 stays 웃어요. These patterns can appear in past and future forms too: 들었어요, 추웠어요, 지을 거예요. A dictionary entry or conjugation reference is more reliable than guessing from spelling alone.

음악을 들어요.

Eumageul deureoyo. — I listen to music.

듣다 shows the ㄷ change before the vowel in 어요.

오늘 날씨가 추워요.

Oneul nalssiga chuwoyo. — The weather is cold today.

춥다 changes to 추워요; the ㅂ does not remain as ㅂ.

저는 그 사실을 몰라요.

Jeoneun geu sasireul mollayo. — I do not know that fact.

모르다 is a 르-pattern verb: 몰라요, not 모러요.

• Irregularity is tied to particular vocabulary; it is not always predictable.
• Learn the present and past together: 들어요/들었어요, 추워요/추웠어요.
• Use an authoritative dictionary when a new conjugation is uncertain.

A reliable workflow for making a sentence

When you meet a new verb, write four pieces: dictionary form, stem, polite present, and a sentence with a clear time expression. For example, 쓰다, 쓰-, 써요, 어제 편지를 썼어요. Then add the future only if your meaning needs a plan or prediction: 내일 편지를 쓸 거예요. This sequence separates stem changes from the choice of tense and keeps you from memorizing isolated endings without knowing what they attach to.

Read endings aloud in short contrasts. Say 가요, 갔어요, 갈 거예요; then 먹어요, 먹었어요, 먹을 거예요. Change one feature at a time and include a subject only when it clarifies the context. Finally, check spacing in forms such as 할 거예요 and the dictionary spelling of irregulars. Korean learners benefit more from a small set of accurate, reusable sentences than from translating every possible English tense into a separate Korean form.

A useful review card can show the Korean form on one side and ask what the speaker is committing to on the other. Is the speaker describing a routine, reporting a finished event, making a plan, or saying that a barrier prevented something? Answer that question before translating. This habit prevents a learner from choosing 했어요 whenever English uses a past-looking phrase or choosing 할 거예요 whenever English uses will.

요즘은 매일 책을 읽어요. 어제는 영화를 봤어요. 내일은 친구를 만날 거예요.

Yojeumeun maeil chaegeul ilgeoyo. Eojeneun yeonghwareul bwasseoyo. Naeireun chingureul mannal geoyeyo. — These days I read a book every day. Yesterday I watched a movie. Tomorrow I will meet a friend.

요즘은 매일 gives the nonpast form a clear habitual reading, while 어제 and 내일 frame the following past and prospective forms.

• Record dictionary form → stem → present → past or future.
• Practice contrasts with one verb at a time.
• Let context and time expressions do part of the translation work.

What to remember about English equivalents

The labels present, past, and future are useful learning handles, but they are not a complete map of Korean meaning. 해요 can describe a habitual action, a current activity, or a scheduled event. 했어요 can report a completed event or answer a meal question that English often translates with have eaten. 할 거예요 often conveys intention or probability rather than an absolute future. Subject omission, particles, adverbs, and the relationship between speakers all contribute information that a short English gloss leaves out.

Start with the polite 해요체 because it is a practical default for many everyday interactions, then learn formal and intimate endings separately in context. For verification, consult the National Institute of Korean Language's Korean-English Learners' Dictionary and its language resources; dictionary examples help reveal which irregulars and collocations are actually used. A form that is grammatically possible may still be unusual, too formal, or misleading in a particular situation.

When you compare examples, preserve the surrounding particles and adverbs instead of studying the verb in isolation. 어제, 지금, 아직, 벌써, and 내일 can change the most natural interpretation even when the verb ending stays the same. Keep a note of both the literal structure and the conversational purpose. That two-line record respects Korean grammar while still giving you a usable English explanation.

• Conjugation encodes more than time: style, mood, and discourse context matter.
• A one-word English translation cannot guarantee one-to-one equivalence.
• Check real dictionary examples before treating a guessed form as natural.

Key takeaways

• Remove 다 to find the stem, then choose an ending for style and meaning.
• Use 아요/어요 for a common polite present, 았어요/었어요 for past, and -(으)ㄹ 거예요 for plans or predictions.
• 안 says an action is not done; 못 says ability or circumstances prevent it.
• Irregular verbs follow recognizable patterns, but individual vocabulary decides which verbs belong to each pattern.
• Tense labels are helpful approximations, not one-to-one translations of English tense.

Next steps

• Grammar practice — Review Korean endings, particles, and sentence patterns with guided practice.
• Korean dictionary — Look up dictionary forms, example sentences, and related vocabulary.