Korean Sound Changes between Words: Sounds, Rules and Examples

Korean sound changes between words are the pronunciation changes that happen across a space when two words are said in one stream, so 밥 먹어요 is spoken [밤머거요]. Liaison, nasalization, aspiration and tensification all cross spaces inside a breath group. This lesson shows when they apply and gives twelve phrases to practise.

Last updated: 2026-10-09.

What you'll learn

• Say 밥 먹어요, 한국 어때, 꽃 안에, 집 나왔어 and 못 해요 with the right changes.
• Explain what a breath group is and how it blocks or allows a change.
• Tell the difference between 꽃이 [꼬치] and 꽃 안에 [꼬다네].
• Mark and read a sentence in breath groups.

Prerequisites: you know the main sound changes. Review Korean Sound Changes Explained first if you can. Estimated time: 25 minutes.

What Are Korean Sound Changes between Words?

Sound changes between words are rules that work on the end of one word and the start of the next. Linguists call this kind of change sandhi, from a Sanskrit word for joining. It is also called connected speech. In Korean, it is a normal part of standard pronunciation, not a casual shortcut.

The rules are the same ones that apply inside a word. A final consonant can link to a following vowel, turn nasal before a nasal, merge with ㅎ, or make the next consonant tense. The only new idea is that the trigger sits after a space. Korean spelling puts a space there (띄어쓰기), but the space is a writing convention and does not always mean a pause. The next section explains why this surprises English speakers.

Why English Speakers Read Word by Word

English speakers read Korean word by word because English writing and speech teach them that a space marks a boundary. English does link words in speech, as in "an apple" said as "anapple", but spelling stays separate and learners rarely feel the link as a rule. In Korean, the link is a rule and it changes the consonant itself.

The result is a mismatch between reading and hearing. A learner who has studied 밥 먹어요 hears [밤머거요] and does not recognise the words. Another learner reads the text aloud with a pause at each space, which sounds slow and stiff. Both problems have the same fix: learn the few changes that cross spaces and read in short groups. The next section sets the main rule.

Do Sound Changes Happen across Spaces?

Yes, sound changes happen across spaces when the words are said in one stream without a pause. They stop at a pause. The table shows how the same rule works inside a word and across a space.

The pattern is the same in each column. The only difference is the space. Because learners of Korean usually meet single words first, they apply the rules inside words and forget them across spaces. That is the biggest gap this lesson fixes. Next, the idea of a breath group explains when the changes stop.

What Is a Breath Group?

A breath group is a stretch of speech said in one breath without a pause. The rules above work inside a breath group. A pause is a boundary, and a change does not cross it. Linguists divide speech into more precisely defined units, such as accentual and intonational phrases, but breath group is easy to apply.

The pause form is not wrong; it is a slower, more careful style. Sentences are usually divided at clause ends, after a topic phrase and at commas. Short phrases of a few words form natural groups. A beginner can follow this rule: no pause between a verb and its object, no pause between a noun and the word that modifies it, and a pause only when the sentence clearly breaks. The page on Korean intonation explains how the voice marks these groups.

Which Cross-Space Rules Do Learners Miss?

Learners most often miss five changes: linking to a full word, nasalization of ㅂ, aspiration with ㅎ, tensification after ㄹ or ㄱ, and ㄴ insertion. The first is the surprising one, because the consonant does not link as written.

The rule is in two parts. A final consonant before a particle or ending links with its real sound: 꽃이 [꼬치]. A final consonant before a full word that starts with ㅏ, ㅓ, ㅗ, ㅜ or ㅟ first changes to its representative sound (one of ㄱ ㄴ ㄷ ㄹ ㅁ ㅂ ㅇ), then links: 꽃 안에 [꼬다네]. These are Articles 13 and 15 of the Standard Pronunciation Rules. Where the full word starts with ㅣ or ㅑ ㅕ ㅛ ㅠ, a ㄴ sound is usually added instead (옷 입어요 [온니버요]) unless the speaker pauses, and the lesson on ㄴ insertion explains it.

The detailed rules for each change are in their own lessons: Korean liaison covers linking. The next section gives twelve phrases for practice.

Twelve Phrases to Practise

Twelve phrases cover the main cross-space changes. Read the spoken form aloud in one breath.

Phrases 6 to 9 show tensification, which turns a plain consonant into a tense one after certain finals. For example, 갈 거예요 uses the future ending -(으)ㄹ, and the consonant after it is tense: 갈 거예요 [갈꺼예요]. Phrase 11 follows the standard example 옷 입다 [온닙따] in Article 29, but the added ㄴ disappears if the speaker pauses after 옷, so you will hear both. Hear a few of these below.

How Does Speaking Style Change the Linking?

Speaking style changes how much linking you hear, but the order of the changes stays the same. Three common styles show the range. The table uses 밥 먹어요 as the example.

Normal conversation is the target for listening, because it matches the Standard Pronunciation Rules. Careful reading is not wrong, but learners who always read this way sound stiff. Fast casual speech adds changes that this lesson does not cover, such as merged vowels and dropped syllables, so do not use it as your first model.

Two practical points follow. First, when a listening clip sounds unfamiliar, try to rewrite it as a series of words with the base spelling: a [ㅁ] before another [ㅁ] or [ㄴ] may be a written ㅂ, so [밤머거요] resolves into 밥 먹어요. Second, if you are unsure whether to link, linking is the safer default. A speaker who links every case at normal speed is rarely misunderstood, while a speaker who never links may sound unnatural. The next section shows how the spelling and the sound relate.

How Spelling Hides the Changes

Spelling does not show the changes because Korean orthography writes the base form of each word, so the same word looks the same in every sentence. Article 1 of Hangul Orthography (한글 맞춤법) says to write standard words as they sound but in keeping with grammar, which in practice keeps each word in its base form and leaves the sounds to the Standard Pronunciation Rules.

This explains a few things that surprise learners. Subtitles and textbooks use spaces to show word boundaries, not sound changes. Dictionaries list headwords, mostly single words, and give the pronunciation of each. A dictation task expects you to write the base form: after you hear [밤머거요] you write 밥 먹어요. Romanization is different, because Revised Romanization follows pronunciation. Inside a word it always shows the change; across a space, materials differ, so you may see bam meogeoyo or bap meogeoyo. The page on romanization pronunciation mistakes discusses the risk of reading it as spelling. A worked example follows.

Worked Example: 밥 먹어요

The phrase 밥 먹어요 uses two rules in sequence. It means "I eat a meal." Follow these steps.

1. Write the blocks. 밥, 먹, 어, 요. The space follows 밥.
2. Mark the breath group. The phrase has no pause, so the whole thing is one group.
3. Find the first change. The ㅂ at the end of 밥 meets the ㅁ at the start of 먹. A stop before a nasal becomes a nasal, so ㅂ becomes ㅁ: [밤 머...].
4. Find the second change. The ㄱ at the end of 먹 meets the vowel of 어. The ㄱ links forward: 머 + 거.
5. Write the spoken form. [밤머거요].
6. Check the romanization. A romanization that follows the spoken phrase gives bam meogeoyo; word-by-word romanization gives bap meogeoyo.

You will know it worked when you hear a hum at the end of 밤 and no k at the end of 먹. A frequent mistake is to nasalize ㅂ but forget the second change, saying [밤먹어요]. Another is to pause after 밥, which blocks the change. Do both steps together.

Common Learner Mistakes

Mistake 1: pausing at every space. Learners often read each word on its own. Actually the changes apply inside a breath group. Fix: mark groups and read each in one stream.

Mistake 2: linking the written final consonant to a full word. Learners often say 꽃 안에 as [꼬차네]. Actually the representative sound comes first, giving [꼬다네]. Fix: apply the representative sound before the link.

Mistake 3: forgetting nasalization across a space. Learners often say 집 나왔어 with a clear ㅂ. Actually the standard is [짐나와써]. Fix: check the first sound of the next word.

Mistake 4: writing the spoken form. Learners often write 밤머거요 in a dictation. Actually spelling keeps 밥 먹어요. Fix: write the base form and say the spoken form.

Mistake 5: applying every rule in every phrase. Learners often over-link in slow speech. Actually pauses, formal reading and personal style reduce the changes. Fix: use the linked form as the default for listening, and add pauses where the sentence breaks.

Practice: Say the Phrase

For each phrase, write the spoken form and name the change.

1. 밥 먹어요
2. 꽃 안에
3. 못 해요
4. 한국 사람
5. 갈 거예요

Then decode this one.

6. [짐나와써]: which phrase is it?

Answers.

1. [밤머거요]: nasalization, then liaison.
2. [꼬다네]: representative sound ㄷ, then liaison.
3. [모태요]: aspiration, ㄷ and ㅎ merge into ㅌ.
4. [한국싸람]: tensification, ㅅ becomes tense after ㄱ.
5. [갈꺼예요]: tensification, ㄱ becomes tense after ㄹ.
6. 집 나왔어, "I left home".

If you got five or six right, move on. If you got fewer, reread the cross-space table and say the phrases aloud in one breath.

Where to Go Next

The next lesson is Korean intonation and rhythm, which shows how the voice groups phrases and why the breath groups in this lesson sound natural. Before this lesson, review Korean Sound Changes Explained. To practise by imitation, see Korean shadowing. The section hub is Korean sound change rules.

This lesson does not teach every rule, the full lists of exceptions or the way fast casual speech shortens phrases. In short, Korean sound changes between words are the same rules that work inside words, applied across a space whenever the words are said in one breath group.

Frequently Asked Questions

Does 밥 먹어요 sound like 밤머거요? Yes, in normal connected speech. The ㅂ of 밥 becomes ㅁ before the ㅁ of 먹어요, and the ㄱ of 먹 links to 어, giving [밤머거요]. A very careful speaker may pause after 밥 and keep the ㅂ. The linked form is what the Standard Pronunciation Rules describe, so use it as your default.

Do all speakers link words? Most do in everyday speech, but not equally. Speed, formality and personal style change how much linking happens, and a pause stops it. Slow, careful reading may keep each word separate. Because the rules describe the typical linked form, learn it for listening first, then choose how much to apply when you speak.

Is it necessary to learn? For listening, yes, because you will hear [밤머거요] when the text says 밥 먹어요 and you must match the two. For speaking, the linking makes you sound more natural but is not required to be understood. Learn the common cross-space changes in this lesson first and add the rest over time.

How do I mark a breath group? Read the sentence aloud once and mark where you would breathe or pause, usually after a clause, a topic phrase or a comma. Draw a slash there. Apply sound changes inside each slash-marked group and treat the slash as a barrier. Short phrases of a few words are typical.

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