The Basics: Noun Modifiers and Essential Verb Endings

Particles tell you who and what and where. Verbs tell you what’s happening. But Korean verbs don’t just stay at the end of sentences. Sometimes, they also turn into adjectives that attach directly to nouns. This post covers how to do that, plus the three verb endings that let you place actions in time.

Noun Modifiers: Turning Verbs into Descriptions

In English, you say “the book I’m reading” or “the movie I saw.” In Korean, you attach a modifier directly to the front of the noun. Which modifier you use depends on the tense and whether the verb is an action verb or a descriptive verb (adjective).

Present tense modifier: -는

Use -는 after the verb stem to describe an action happening now or a general/habitual action.

• 읽는 책 = the book (that I’m) reading
• 가는 사람 = the person (who is) going
• 먹는 음식 = the food (that I’m) eating

This only works for action verbs. For descriptive verbs (Korean adjectives), the present modifier is different (see below).

Past tense modifier: -(으)ㄴ

Use -(으)ㄴ after the verb stem to describe an action that has already happened. Add -ㄴ after a vowel, -은 after a consonant.

• 본 영화 = the movie (that I) saw (보다 → 보 + ㄴ)
• 읽은 책 = the book (that I) read (읽다 → 읽 + 은)
• 온 사람 = the person who came (오다 → 오 + ㄴ)

For descriptive verbs (adjectives), -(으)ㄴ also works as the present modifier. That’s because Korean adjectives describe a state, not an action in progress.

• 큰 집 = a big house (크다 → 크 + ㄴ)
• 작은 고양이 = a small cat (작다 → 작 + 은)
• 예쁜 꽃 = a pretty flower (예쁘다 → 예쁘 + ㄴ)

So when you see -은/ㄴ on a descriptive verb, it means “the [noun] that is [adjective].” When you see it on an action verb, it means “the [noun] that [verbed].” Context tells you which.

Future modifier: -(으)ㄹ

Use -(으)ㄹ to describe something that will happen, something you plan to do, or something that might happen. Add -ㄹ after a vowel, -을 after a consonant.

• 볼 영화 = the movie (that I’ll) watch (보다 → 보 + ㄹ)
• 먹을 음식 = the food (that I’ll) eat (먹다 → 먹 + 을)
• 갈 곳 = the place (I’ll) go (가다 → 가 + ㄹ)

This also shows up in the polite future ending -ㄹ/을 거예요 (see below).

For descriptive verbs, the future modifier is uncommon and usually replaced with other structures.

Putting modifiers to work

Once you have these, you can build complex noun phrases before you know a single relative pronoun in Korean. There’s no “who,” “which,” or “that” since the modifier does all the work.

• 제가 어제 본 영화 = the movie I saw yesterday
• 지금 공부하는 학생 = the student studying now
• 내일 만날 친구 = the friend I’ll meet tomorrow

Notice how the entire verb phrase sits directly before the noun. No relative pronoun needed.

The Three Essential Verb Endings

Now that you can modify nouns with verbs, you still need to end sentences. Here are the three core endings that place actions in time. These are all in the 해요체 (polite informal).

Present: -아/어/여요

This is your default ending. Use -아요 after a verb stem that ends with ㅏ or ㅗ; -어요 for everything else; -여요 for 하다 verbs (which becomes 해요 in contraction).

• 가다 → 가요 (stem 가 ends in ㅏ)
• 보다 → 봐요 (보다 → 보 + 아요 → 봐요)
• 먹다 → 먹어요 (stem 먹 ends in a consonant other than ㅏ/ㅗ)
• 하다 → 해요 (하다 → 하 + 여요 → 해요)

This ending covers:

• Present tense: 지금 밥을 먹어요. = I’m eating now. (Technically, it can also mean I’m eating rice now.)
• Habitual: 아침에 커피를 마셔요. = I drink coffee in the morning.
• General facts: 한국어는 재미있어요. = Korean is interesting.

Past: -았/었/였어요

Add -았어요 after stems ending in ㅏ or ㅗ; -었어요 for everything else; -였어요 for 하다 verbs (which becomes 했어요).

• 가다 → 갔어요 (가 + 았어요 → 갔어요)
• 보다 → 봤어요 (보 + 았어요 → 봤어요)
• 먹다 → 먹었어요
• 하다 → 했어요

This ending is always past. There’s no perfect/imperfect distinction the way there is in English. It simply marks that something happened before now.

• 어제 영화를 봤어요. = I watched a movie yesterday.
• 작년에 한국에 갔어요. = I went to Korea last year.

If you still find yourself trying to make word-by-word direct translations from Korean to your native language, this article may help you.

Future/Probable: -(으)ㄹ 거예요

Add -ㄹ 거예요 after a vowel, -을 거예요 after a consonant. This marks a future event or a prediction about something that hasn’t happened yet.

• 가다 → 갈 거예요 = I’ll go / I’m going to go
• 먹다 → 먹을 거예요 = I’ll eat / I’m going to eat
• 하다 → 할 거예요 = I’ll do

It’s also used for guessing about the present or past when you’re not certain, but that’s an intermediate nuance. For now, treat it as “will” or “going to.”

Putting them side by side

Why this matters before you go deeper

The noun modifiers and verb endings are the two sides of the same coin. Once you have these, you can build sentences that describe specific people, things, and times without needing any relative pronouns or complex conjunctions. More importantly, you stop translating word-for-word from English.

Practicing with 30 Days of Korean Speaking will make you encounter these situations in context, as you’ll be going off of prompts to practice speaking Korean. It’s great to catch these during passive listening, but it’s even better if you attempt to produce them in the context of real-time speaking. What this post does is name the patterns so you can form them and recognize them when they show up in new vocabulary.

Part 4 of this series will cover the connective endings that let you string multiple clauses together into a single sentence.