Verb Stems in Korean

In Brief

Korean dictionary forms normally end in -다. Remove -다 to find the stem (the part that carries the central meaning): 가다 → 가-, 먹다 → 먹-, and 하다 → 하-. Korean then builds usable forms by attaching endings to the stem; the stem's final sound often determines which version of an ending is needed.

Overview

A Korean verb is not usually placed in a sentence exactly as it appears in a dictionary. The dictionary lists 먹다 “to eat,” but everyday speech uses forms such as 먹어요 “eat/eats” and 먹었어요 “ate.” These forms share 먹-, the verb stem. An ending is the piece attached after that stem to express politeness, tense, connection to another action, and other grammatical information.

This is a basic A1 skill because nearly every later conjugation rule starts with “take the stem and add….” Korean does not change a verb according to the subject's person or number in the way English distinguishes go and goes. 가요 can describe “I go,” “you go,” “she goes,” or “they go”; the surrounding conversation usually makes the subject clear. What changes most visibly is the material after the stem.

The beginner procedure is simple: locate the final -다, remove it, and inspect the last sound left behind. That gives you a reliable starting point even when a later ending causes a contraction or an irregular sound change.

How It Works

Dictionary form = stem + -다

The dictionary form (the form used as a vocabulary heading) consists of a stem followed by -다. A hyphen after a stem is only a teaching convention: 가- is not written with a hyphen in normal Korean.

Dictionary form	Meaning	Remove	Stem
가다	to go	다	가-
오다	to come	다	오-
먹다	to eat	다	먹-
읽다	to read	다	읽-
하다	to do	다	하-
공부하다	to study	다	공부하-

Do not remove the whole final syllable. In 먹다, only 다 is removed, so the stem is 먹-, not 머-. Hangul syllable blocks may contain a final consonant, and that consonant belongs to the stem.

Vowel stems and consonant stems

Look at the final syllable of the stem. A vowel stem ends without a final consonant; a consonant stem ends in 받침, a consonant written at the bottom of the final Hangul block.

Stem type	Dictionary form	Stem	What to notice
Vowel stem	가다	가-	가 has no 받침
Vowel stem	배우다	배우-	우 has no 받침
Vowel stem	마시다	마시-	시 has no 받침
Consonant stem	먹다	먹-	ㄱ is the 받침 in 먹
Consonant stem	앉다	앉-	ㄵ is the final consonant cluster
Consonant stem	읽다	읽-	ㄺ is the final consonant cluster

This distinction matters for endings that have two forms. For example, the formal polite ending is -ㅂ니다 after most vowel stems and -습니다 after most consonant stems.

Stem	Ending selected	Result	Meaning
가-	-ㅂ니다	갑니다	go/goes (formal)
오-	-ㅂ니다	옵니다	come/comes (formal)
먹-	-습니다	먹습니다	eat/eats (formal)
읽-	-습니다	읽습니다	read/reads (formal)

The spelling 갑니다 illustrates how Hangul combines pieces: the ㅂ supplied by the ending becomes the final consonant of 갑. The stem is still 가-.

Other endings present a choice with 으 in parentheses, such as -(으)세요 or -(으)ㄹ. Parentheses mean that 으 appears only in certain environments, usually after a consonant stem:

Stem	Pattern	Result
가-	-(으)세요	가세요
먹-	-(으)세요	먹으세요
가-	-(으)ㄹ 거예요	갈 거예요
먹-	-(으)ㄹ 거예요	먹을 거예요

There are additional rules for stems ending in ㄹ, introduced later in this article.

Endings that attach directly

Some endings attach without choosing between a vowel and consonant version. -고 “and/then,” for example, follows the same stem-finding procedure for both types.

Dictionary form	Stem + ending	Result
가다	가- + -고	가고
먹다	먹- + -고	먹고
공부하다	공부하- + -고	공부하고

This makes direct-attachment endings useful for checking whether you have identified a stem correctly.

The everyday polite -아/어요 pattern

With -아/어요, vowel choice and contraction make the boundary less obvious. As a beginner rule, use -아요 after a stem whose last vowel is ㅏ or ㅗ, and -어요 after most other vowels. 하다 follows the very common pattern 해요.

Dictionary form	Stem	Combination	Usual result
살다	살-	살- + -아요	살아요
먹다	먹-	먹- + -어요	먹어요
가다	가-	가- + -아요	가요
오다	오-	오- + -아요	와요
마시다	마시-	마시- + -어요	마셔요
하다	하-	하- + -여요	해요

Forms such as 가요, 와요, and 마셔요 do not mean that the original stems were 가요-, 와-, or 마셔-. Always return to the dictionary form when identifying the stem.

하다 and noun + 하다 verbs

하다 means “to do,” and its stem is 하-. It also combines productively with many nouns to make verbs. A noun is a naming word, such as “study,” “exercise,” or “work.”

Dictionary form	Components	Stem	Meaning
하다	하 + 다	하-	to do
공부하다	공부 + 하다	공부하-	to study
운동하다	운동 + 하다	운동하-	to exercise
일하다	일 + 하다	일하-	to work
전화하다	전화 + 하다	전화하-	to phone

When an ending attaches, it follows 하-: 공부해요, 운동합니다, 전화하고. For conjugation practice, treat 공부하- as the complete stem. In sentence analysis, it can also be useful to recognize the noun 공부 plus 하다.

Action verbs and descriptive verbs

Korean also has descriptive verbs, words that express a quality and often correspond to English adjectives. They take endings, so the same stem method applies.

Dictionary form	Stem	Natural English meaning	Polite form
좋다	좋-	to be good	좋아요
작다	작-	to be small	작아요
크다	크-	to be big	커요
바쁘다	바쁘-	to be busy	바빠요

English says “the room is big,” using is plus an adjective. Korean can put the descriptive verb directly at the end: 방이 커요. Although English translation habits may suggest otherwise, 크- is a stem that conjugates.

Examples in Context

The bold form in each sentence shows the conjugated predicate. The note identifies the dictionary form and stem behind it.

Korean	English	Note
저는 매일 학교에 가요.	I go to school every day.	가다 → 가-; vowel stem
친구가 지금 와요.	My friend is coming now.	오다 → 오-; 오 + 아요 contracts
아침에 빵을 먹어요.	I eat bread in the morning.	먹다 → 먹-; consonant stem
저녁에 책을 읽어요.	I read a book in the evening.	읽다 → 읽-; consonant cluster
한국어를 공부해요.	I study Korean.	공부하다 → 공부하-; 하여요 contracts to 해요
주말에도 일해요.	I work on weekends too.	일하다 → 일하-
물을 마시고 집에 가요.	I drink water and go home.	마시- + -고; 가- + -아요
저는 요리하고 동생은 청소해요.	I cook, and my younger sibling cleans.	청소하다 → 청소하-
이 식당은 음식이 좋아요.	The food at this restaurant is good.	좋다 → 좋-; descriptive verb
오늘은 조금 바빠요.	I am a little busy today.	바쁘다 → 바쁘-; vowel change in the polite form
버스가 곧 옵니다.	The bus is coming soon.	오- + -ㅂ니다
저는 고기를 먹습니다.	I eat meat.	먹- + -습니다
음악을 듣고 책을 읽습니다.	I listen to music and read a book.	듣- + -고; 읽- + -습니다

Notice that the English subject does not tell you which Korean verb form to choose. 가요 remains 가요 whether the understood subject is “I,” “you,” or “they.” Context supplies that information.

Common Mistakes

Removing more than -다

• Wrong: 먹다 → 머-
• Right: 먹다 → 먹-
• Why: The final ㄱ in 먹 is part of the stem. Remove the syllable 다, not the last consonant of the preceding block.

Treating a polite form as the stem

• Wrong: 마셔요 → 마셔- as the dictionary stem
• Right: 마시다 → 마시-, then 마시- + -어요 → 마셔요
• Why: Contraction may change how the stem and ending look together. Find the dictionary form before analyzing the stem.

Adding an ending to the full dictionary form

• Wrong: 먹다어요
• Right: 먹어요
• Why: Dictionary -다 is removed before the sentence ending is attached: 먹- + -어요.

Assuming every vowel stem behaves identically

• Wrong: 오어요
• Right: 와요
• Why: Stem type helps select an ending, but adjacent vowels often contract. 오- + -아요 becomes 와요 in standard usage.

Splitting 하다 compounds in the wrong place

• Wrong: 공부하다 → 공부- when asked for the verb stem
• Right: 공부하다 → 공부하-
• Why: 공부 is the noun component, but the conjugating stem of the complete verb includes 하-.

Expecting a special form for “he” or “she”

• Wrong idea: changing 가요 because the subject is third-person singular
• Right: 저는 가요. 그 사람도 가요. — “I go. That person goes too.”
• Why: Korean verbs do not agree with the subject's person or number. Their endings encode other information, especially speech level, tense, and sentence function.

Usage Notes

The dictionary form is essential for looking up vocabulary, but it is not a neutral polite sentence ending. In conversation with someone who requires ordinary politeness, use a suitable ending such as -아/어요 rather than saying isolated 가다 or 먹다. You may nevertheless hear dictionary-shaped forms in quotations, definitions, notes, headlines, exclamations, and some styles of plain speech.

Romanized spellings can hide whether a stem has 받침. Learn the Hangul form rather than deciding from transliteration: 먹다 visibly preserves the final ㄱ, while a romanization such as meokda is only an approximation of pronunciation.

Pronunciation and spelling are not always identical. For example, 읽다 is spelled with the stem 읽-, even though not every consonant is heard separately in every environment. Determine the stem from standard spelling and the dictionary form, not only from what you think you hear.

Beyond the Basics / Advanced Use

You do not need to master all of the following at A1, but these patterns explain why “remove -다” is a starting point rather than a complete conjugation system.

Irregular changes do not erase the dictionary stem

Some stems change before particular vowel-initial endings. The change depends on the lexical verb and the ending; it does not mean you should invent a different permanent stem.

Dictionary form	Dictionary stem	Example form	Change to notice
듣다	듣-	들어요	ㄷ changes to ㄹ before this vowel-initial ending
돕다	돕-	도와요	ㅂ changes in this conjugation
쓰다	쓰-	써요	ㅡ drops before -어요
모르다	모르-	몰라요	르 pattern adds ㄹ to the preceding syllable
짓다	짓-	지어요	ㅅ drops before this vowel-initial ending

Not every verb with the same final consonant is irregular. For instance, 받다 → 받아요 keeps ㄷ. Learn an irregular verb together with one common conjugated form.

ㄹ-ending stems form a special subgroup

A stem such as 살- “live” is a consonant stem, but ㄹ has special interactions with several endings. It remains before -아요 and direct -고: 살아요, 살고. Before endings beginning with ㄴ, ㅂ, or ㅅ, the ㄹ often disappears: 삽니다 “live (formal),” not 살습니다.

With future or attributive -(으)ㄹ, no extra 을 is added after an existing ㄹ: 살다 → 살 거예요. This is why the two-way label “vowel or consonant stem” is useful but not sufficient for every later ending.

A surface form may contain several layers

Longer Korean verb forms are often built from the stem plus more than one grammatical piece:

Form	Useful analysis	Meaning
먹었어요	먹- + -었- + -어요	ate
가고 싶어요	가- + -고 싶- + -어요	want to go
공부하겠습니다	공부하- + -겠- + -습니다	will study / intend to study

The hyphenated analysis is a learning aid, and grammar references may divide certain endings somewhat differently. The practical point remains the same: identify the dictionary stem first, then work outward through the added pieces.

Not every final 다 you see is simply a removable dictionary marker

In a vocabulary entry such as 가다, final -다 marks the citation form. However, -다 also appears as a plain declarative ending in particular written and spoken styles: 비가 온다 “It is raining.” In a complete sentence, do not automatically assume that deleting its final syllable reveals a dictionary entry without further analysis. At the beginner stage, apply the removal rule to forms explicitly presented as dictionary forms.

Practice Tips

1. Make a three-column list. For each new verb, write the dictionary form, stem, and stem type: 먹다 | 먹- | consonant. Include several 하다 compounds and descriptive verbs, not only action verbs.
2. Build three forms from one stem. Try a polite form, a formal form, and -고: 가요 / 갑니다 / 가고; 먹어요 / 먹습니다 / 먹고. This separates stem recognition from ending choice.
3. Trace difficult forms backward. When you meet 마셔요 or 도와요, look up 마시다 or 돕다, remove -다, and then note the contraction or irregular change. Do not memorize the surface form as a new stem.

Related Concepts

• Next step: Polite Ending -아/어요 — use vowel choice and contractions to make the most common everyday polite forms.
• Next step: Formal Ending -ㅂ니다/습니다 — choose an ending according to the stem's final sound in formal polite speech.
• Next step: Connecting with -고 — attach one ending directly to a stem to link actions or descriptions.