Adjusting Formality — I can adjust formality (polite vs casual) in supported contexts based on relationship and situation. - Korean

SECTION 1

Historical Context & Motivation

Korean is one of the world's most fascinating languages when it comes to expressing social relationships through grammar. Unlike English, where politeness is mostly about word choice and tone of voice, Korean has entire speech levels (called 존댓말 for polite speech and 반말 for casual speech) built directly into verb endings. This system didn't appear overnight — it evolved over centuries, shaped by Korea's deeply Confucian social structure and hierarchical traditions.

57 BCE–668 CE • Three Kingdoms Period

Early Korean kingdoms develop distinct court languages with honorific markers to address royalty and officials, reflecting strict social hierarchies.

1392–1897 • Joseon Dynasty & Confucian Influence

Neo-Confucian philosophy becomes the state ideology, codifying relationships between ruler–subject, parent–child, and elder–younger. These relationships deeply shape the Korean honorific system into a multi-layered structure.

1443 • Invention of Hangul

King Sejong the Great creates the Korean alphabet (한글), making literacy accessible beyond the elite. Written records now capture different speech levels used across social classes.

1945–Present • Modern Korean Speech Levels

After Korean independence, the language is standardized. Modern Korean settles into roughly seven recognized speech levels, though everyday conversation mainly uses two to three. The polite/casual distinction remains essential in daily life.

So why should you care about formality levels? Imagine calling your teacher "dude" or texting your best friend like you're writing a business email — it would feel completely wrong. In Korean, using the wrong speech level isn't just awkward; it can come across as genuinely disrespectful. The core question this lesson addresses is: How do I know when to speak politely versus casually, and how do I actually change my sentences to match?

SECTION 2

Core Principles of Korean Formality

Before diving into verb conjugations, it's essential to understand the social logic behind formality in Korean. The system is governed by a few fundamental principles that determine which speech level you should use in any given situation.

Age & Seniority (나이)

Korean culture places great importance on age. If someone is even one year older than you, you're generally expected to use polite speech (존댓말) when speaking to them, especially when you first meet.

Social Distance (사회적 거리)

Strangers, acquaintances, and people in formal settings receive polite speech. As your relationship grows closer, you may transition to casual speech — but only if both parties agree or the older person initiates the change.

Context & Setting (상황)

Even close friends might switch to polite speech in a professional or public setting. A job interview, a classroom, or meeting someone's parents all call for more formal language regardless of age.

Power Dynamic (권력 관계)

Teachers, bosses, and authority figures receive polite speech. The person in the lower-status position typically uses 존댓말, while the higher-status person may use 반말 in return.

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KEY TAKEAWAY

Think of Korean speech levels like a volume dial on a speaker. When you walk into a library, you instinctively lower your voice. When you're at a concert with friends, you shout freely. Korean formality works the same way — you "adjust the dial" based on who is listening and where you are. 존댓말 (polite speech) is your library voice, and 반말 (casual speech) is your concert voice. The trick is reading the room.

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Visual Explanation — The Formality Spectrum

Korean has roughly seven speech levels, but in everyday life you'll mostly use two: the 해요체 (polite-informal) and the 해체 (casual). The diagram below shows where these two fit on the full formality spectrum, along with examples of who you'd talk to using each level.

The spectrum shows three key speech levels. Notice that 해요체 (polite-informal) sits in the middle — it's polite enough for most situations but not stiff. The 해체 (casual) is reserved for people you're genuinely close to or younger than you.

As a learner, the safest strategy is to always start with 해요체 (polite-informal). It works in virtually any situation and won't offend anyone. You can think of it as your "default mode" in Korean. You only switch to 반말 when someone older explicitly says "말 놓으세요" (literally "put down your speech"), which means "feel free to speak casually." Among same-age friends, casual speech usually develops naturally once you've become close.

SECTION 4

How It Works — Verb Ending Transformations

The magic of Korean formality lies in verb endings. The verb stem stays the same, but you swap the ending to shift the entire tone of your sentence. This is the mechanical heart of the system, and once you learn the pattern, you can transform any sentence between polite and casual forms.

The Conjugation Formula

POLITE FORM (해요체)

Verb Stem + 아요 / 어요 / 해요

If the last vowel of the stem is ㅏ or ㅗ → add 아요. Otherwise → add 어요. Verbs ending in 하다 → change to 해요.

CASUAL FORM (해체 / 반말)

Verb Stem + 아 / 어 / 해

The casual form is simply the polite form with 요 removed. That's it! The suffix 요 is the politeness marker, and dropping it switches you to 반말.

Let's look at this with the verb 먹다 (to eat). The stem is 먹 (remove 다 from the dictionary form). The last vowel in 먹 is ㅓ, which is neither ㅏ nor ㅗ, so we use 어요 for polite and 어 for casual. Result: 먹어요 (polite) versus 먹어 (casual). The meaning is identical — only the social tone changes.

Beyond Verbs — Other Formality Markers

Formality adjustments go beyond just verb endings. You'll also encounter changes in sentence-final particles, vocabulary choices, and even how you say "yes" and "no." In polite speech, "yes" is 네 (ne), while in casual speech among friends it becomes 응 (eung). Similarly, "no" shifts from 아니요 (aniyo) to 아니 (ani). Even the word for "I" changes: 저 (jeo) in polite speech versus 나 (na) in casual speech.

SECTION 5

Detailed Breakdown — Common Verb Conjugations

The table below shows the most common Korean verbs conjugated in both polite (해요체) and casual (해체) forms. Study the patterns carefully — you'll start to notice that the casual form is almost always just the polite form without 요.

Dictionary Form	Meaning	Polite (해요체)	Casual (해체)
가다	to go	가요	가
오다	to come	와요	와
먹다	to eat	먹어요	먹어
마시다	to drink	마셔요	마셔
하다	to do	해요	해
보다	to see	봐요	봐
있다	to exist/have	있어요	있어
없다	to not exist/not have	없어요	없어
좋다	to be good	좋아요	좋아
알다	to know	알아요	알아

Common Korean verbs in polite vs. casual forms

This flowchart illustrates the decision process for choosing between polite and casual speech. Notice how the same sentence ("Did you eat?") changes only in its verb ending: 먹었어요 (polite) versus 먹었어 (casual).

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Vocabulary Shifts

Some words change entirely between polite and casual contexts. For example, "I" is 저 (jeo) in polite speech but 나 (na) in casual speech. "Yes" is 네 (ne) politely but 응 (eung) casually. These vocabulary swaps work alongside verb ending changes to create a complete shift in tone.

SECTION 6

Worked Example — Converting a Polite Dialogue to Casual

Let's walk through a realistic scenario. Imagine you've written a short dialogue in polite Korean (해요체) and now you need to convert it to casual Korean (해체) because the conversation is between two close same-age friends. The original polite dialogue is:

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Original Polite Dialogue

A: 안녕하세요! 오늘 뭐 해요? (Hello! What are you doing today?) B: 저는 영화 봐요. 같이 갈래요? (I'm watching a movie. Want to go together?) A: 네, 좋아요! 몇 시에 만나요? (Yes, sounds good! What time shall we meet?) B: 세 시에 만나요. 거기서 봐요! (Let's meet at 3. See you there!)

Converting Polite → Casual (해요체 → 해체)

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Step 1 — Change the Greeting

안녕하세요 is the polite greeting. For casual speech between friends, this becomes simply 안녕. We drop the formal suffix -하세요.

안녕하세요 → 안녕
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Step 2 — Remove 요 from Verb Endings

This is the core transformation. Every verb ending with 요 loses it. 해요 becomes 해, 봐요 becomes 봐, 갈래요 becomes 갈래, 좋아요 becomes 좋아, 만나요 becomes 만나.

뭐 해요? → 뭐 해? | 봐요 → 봐
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Step 3 — Swap Pronouns

The polite first-person pronoun 저 changes to the casual 나. So "저는 영화 봐요" becomes "나는 영화 봐" or even just "나 영화 봐" since particles are often dropped in casual speech.

저는 → 나 (or 나는)
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Step 4 — Change Response Words

The polite "yes" (네) becomes the casual 응. Similarly, if there were a polite "no" (아니요), it would become 아니.

네 → 응
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Step 5 — Assemble the Casual Dialogue

Putting it all together, the full casual version reads: A: 안녕! 오늘 뭐 해? B: 나 영화 봐. 같이 갈래? A: 응, 좋아! 몇 시에 만나? B: 세 시에 만나. 거기서 봐! Notice how the meaning is exactly the same — only the social register has changed.

Conversion complete — same meaning, casual tone!

SECTION 7

Polite vs. Casual — Side-by-Side Comparison

Now that you've seen how the conversion works, let's look at a comprehensive side-by-side comparison of key phrases and features across both speech levels. This table is a quick-reference guide you can come back to whenever you're unsure which form to use.

Feature	Polite (해요체)	Casual (해체 / 반말)
Greeting	안녕하세요	안녕
"I"	저	나
"Yes" / "No"	네 / 아니요	응 / 아니
"Thank you"	감사합니다 / 고마워요	고마워
"Sorry"	죄송합니다 / 미안해요	미안해
"Please give me"	주세요	줘
Verb ending pattern	-아요 / -어요 / -해요	-아 / -어 / -해
Question marker	Rising tone + 요	Rising tone (no 요)
Goodbye (person leaving)	안녕히 가세요	잘 가
Goodbye (person staying)	안녕히 계세요	잘 있어

Key phrases in polite vs. casual Korean

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KEY TAKEAWAY

Think of 요 as a politeness "wrapper" around your sentences — like gift-wrapping a present before handing it to someone. When you're with close friends, you skip the wrapping and just hand over the gift directly. The core message (the gift) never changes; only the packaging does. If you're ever in doubt, keep the wrapper on — it's always safer to be a bit too polite than accidentally rude.

SECTION 8

Connection to Advanced Formality — Formal Speech & Honorifics

The polite and casual levels you've learned are the foundation, but Korean's formality system goes deeper. As you advance, you'll encounter the 하십시오체 (formal-polite) level used in news broadcasts, business presentations, and military settings, as well as the honorific system (높임법) that changes not just endings but entire verb stems when talking about someone of high status.

Feature	What You Know Now	Advanced Level
Speech levels covered	해요체 (polite) & 해체 (casual)	All 7 levels including 하십시오체, 하오체, 하게체
Honorific verbs	Not yet introduced	먹다 → 드시다, 자다 → 주무시다 (special honorific stems)
Honorific suffix	Not yet used	-(으)시- inserted before ending: 가세요, 드세요
Humble forms	저 (humble "I")	드리다 (humble "give"), 뵙다 (humble "meet")
Context of use	Daily conversations	Business, ceremonies, talking about elders to others

Current knowledge vs. advanced formality

Don't worry about mastering all seven levels right away. Even most native Korean speakers primarily use the two levels you've learned in this lesson for everyday conversation. The formal-polite level (하십시오체) will come naturally as you encounter it in Korean media, and the honorific verb system is a topic for intermediate study. For now, being able to confidently switch between 해요체 and 해체 gives you the tools to handle the vast majority of real-life Korean conversations.

SECTION 9

Practice Problems

Question 1: CONCEPTUAL

Your Korean friend's mom offers you dinner. She says, "밥 먹었어요?" (Have you eaten?). Should you respond in 해요체 (polite) or 해체 (casual)? Explain your reasoning.

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You should respond in 해요체 (polite). Your friend's mom is older than you and is an adult authority figure. Even though you might be comfortable in her home, the age difference and the parent-status relationship require polite speech. You would say something like "네, 먹었어요" (Yes, I've eaten) or "아니요, 아직 안 먹었어요" (No, I haven't eaten yet). Using 반말 with a friend's parent would be considered very rude in Korean culture.

Question 2: BASIC

Convert the following polite sentence to casual: "오늘 뭐 해요?" (What are you doing today?)

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The casual form is "오늘 뭐 해?" To convert, you simply remove 요 from the verb ending 해요, making it 해. The question word 뭐 (what) and the time word 오늘 (today) stay the same because they don't carry formality markers. The question is still indicated by rising intonation, just without the 요 politeness suffix.

Question 3: INTERMEDIATE

Rewrite this casual dialogue into polite Korean (해요체). Friend A: "나 내일 서울에 가. 같이 갈래?" Friend B: "응! 좋아. 몇 시에 출발해?"

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The polite version would be: A: "저 내일 서울에 가요. 같이 갈래요?" B: "네! 좋아요. 몇 시에 출발해요?" Here's what changed: 나 → 저 (casual "I" to polite "I"), 가 → 가요 (add 요), 갈래 → 갈래요 (add 요), 응 → 네 (casual "yes" to polite "yes"), 좋아 → 좋아요 (add 요), 출발해 → 출발해요 (add 요). The place name 서울 and time word 내일 don't change.

Question 4: APPLIED

You arrive at a Korean coffee shop. Write a short exchange where you order a coffee from the barista using appropriate formality. Then rewrite the same order as if you were asking your close friend to grab you a coffee. Include at least three sentences in each version.

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At the coffee shop (해요체): "안녕하세요. 아이스 아메리카노 하나 주세요. 감사합니다!" (Hello. One iced Americano, please. Thank you!) To your close friend (해체): "야, 나 아이스 아메리카노 하나 사 줘. 고마워!" (Hey, buy me one iced Americano. Thanks!) Notice the key differences: 안녕하세요 disappears (you'd use 야 to get a friend's attention), 주세요 (polite 'please give') becomes 줘 (casual 'give'), and 감사합니다 (very polite 'thank you') becomes 고마워 (casual 'thanks'). The barista scenario uses polite speech because you're interacting with a stranger in a service context.

Question 5: CRITICAL THINKING

Imagine you're a Korean high school student. Your teacher (whom you normally speak to in 해요체) is also your neighbor, and you see them at a casual weekend barbecue with your families. Your parents and the teacher say, "편하게 말해" (speak comfortably). How would you handle the formality level during the barbecue? What about when you return to school on Monday? Explain the cultural reasoning behind your choices.

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This is a nuanced situation that many Korean speakers navigate carefully. Even though the teacher invited you to speak casually at the barbecue, most Korean students would slightly lower their formality but not switch to full 반말. You might drop some of the stiffness (using 해요체 more naturally instead of the very formal 하십시오체), but completely dropping 요 with a teacher would still feel uncomfortable for most students. The phrase "편하게 말해" is often an invitation to relax, not necessarily to abandon all politeness. On Monday at school, you would absolutely return to your normal 해요체 or even 하십시오체 because the school context reactivates the teacher-student power dynamic. This illustrates a key principle: formality in Korean isn't just about the person — it's about the combination of person AND situation. The same relationship can require different speech levels in different settings.

SUMMARY

Lesson Summary

Summary

Korean formality revolves around two main everyday speech levels: 해요체 (polite-informal) and 해체 (casual / 반말). The choice between them depends on age, social distance, context, and power dynamics. The mechanical transformation is straightforward: polite forms end in -아요 / -어요 / -해요, and you create casual forms by simply dropping the 요. Beyond verb endings, remember to adjust pronouns (저 → 나), response words (네 → 응), and common phrases (감사합니다 → 고마워).

When in doubt, always default to 해요체 — it's polite enough for nearly any situation without being overly stiff. Only switch to 반말 when you're with close friends of the same age, speaking to someone younger, or when an older person explicitly invites you to speak casually. As you continue learning, you'll discover advanced honorific forms and formal speech levels that add even more precision to how Korean expresses social relationships through language.