Korean descriptive predicates and adjective forms

01 / Understand

Let a descriptive predicate finish the sentence

The dictionary form 크다 describes being big. In ordinary polite conversation it becomes 커요. A sentence such as 방이 커요 is complete: “The room is big.” English uses is, but Korean does not add 이에요, the ending that follows a noun, after this descriptive predicate. 방이에요, by contrast, identifies something as a room. Description and identification use different structures.

The contrast is easier to see if the subject stays constant. You can identify an object as a bag with 가방이에요, then describe the bag with 커요. Each utterance answers a different question. “Is it a bag?” asks about identity; “Is it big?” asks about a property. Do not take the English presence of be as evidence that both must contain the same Korean ending.

A dictionary form is useful for looking up vocabulary, but it is not automatically the polite form to say to a stranger. Record a new descriptive word with one complete polite example. That example shows both meaning and sentence behavior. Later transformations can build on the known stem, the part before 다, instead of relying on a translation label alone.

02 / Understand

Use the vowel pattern and recognize contractions

The polite descriptive endings use the familiar 아요 and 어요 system. 작다 becomes 작아요, and 좋다 becomes 좋아요. Words with a stem vowel other than ㅏ or ㅗ normally use the 어요 pattern. The written result may contract, so learn the complete pronunciation and spelling of frequent forms.

For a ㅡ stem, the final ㅡ drops before the vowel ending. 크다 becomes 커요; 바쁘다 becomes 바빠요; 예쁘다 becomes 예뻐요. In longer stems, the preceding syllable helps determine the vowel. This is a specific pattern, not permission to delete any vowel that looks inconvenient.

Compare one regular consonant stem with one ㅡ stem while keeping the sentence purpose the same. Both can politely describe a room or a person, but their surface endings differ because of stem structure. A learner who memorizes only the English adjectives big and busy may miss this relation. Identify the dictionary stem first, then apply the known pattern and read the whole result.

03 / Understand

Learn common irregular words as contrasts

Some descriptive predicates with final ㅂ change before a vowel ending. 춥다 becomes 추워요, and 덥다 becomes 더워요. The pattern is common among descriptive predicates, but not every stem ending in ㅂ is irregular. 좁다, “narrow,” has regular 좁아요. Record the class with the word instead of guessing solely from the last consonant.

Another useful family has 르. 빠르다 becomes 빨라요, with the additional rieul, ㄹ, reflected in the spelling. That is different from simply deleting the vowel ㅡ in every word. The pattern of each word matters. These examples are a small starter set, not a claim that every irregular Korean form has been covered.

Practice a paired sentence in which the situation makes the meaning clear: cold weather, hot weather, a narrow room, or a fast bus. Then change the topic while preserving the predicate. The vocabulary should remain accurate as you focus on the ending. A correct irregular form attached to an unrelated subject can still communicate the wrong description.

04 / Understand

Negate a description without changing its category

A straightforward short negative places 안 before the descriptive predicate: 안 커요, “is not big.” A longer pattern uses the stem plus 지 않아요: 크지 않아요. Both deny the property in the stated context. Neither turns the descriptive predicate into a noun needing 아니에요.

Words ending in 하다 can be descriptive as well as action verbs. 조용하다 means “be quiet” and becomes 조용해요. Its longer negative 조용하지 않아요 clearly negates the description. Do not assume every 하다 word means an action that can be performed on command. The word’s meaning determines which constructions are appropriate.

Negating a property does not automatically assert its opposite. “Not big” could mean medium sized rather than small, and “not quiet” may describe moderate noise rather than extreme loudness. If a practical comparison requires the stronger claim, choose the appropriate positive word. This semantic distinction is useful when describing rooms, choosing objects, or reporting conditions accurately.

05 / Understand

Change the form before a noun

Before a noun, many descriptive predicates take a modifier ending, which makes a modifier, the form that describes a following noun. The ending is 은 after a consonant stem and a final ㄴ after a vowel stem. 작다 gives 작은 방, “a small room”; 크다 gives 큰 방, “a big room.” The polite sentence ending 어요 does not remain inside this noun phrase.

A rieul stem loses that rieul before this modifier ending: 길다 gives 긴 길, “a long road.” The ㅂ irregular pattern also affects forms such as 추운 날, “a cold day.” Descriptive predicates built on 있다 or 없다 take 는 instead, as in 재미있는 책, “an interesting book.” Do not replace every modifier with the same ending.

This distinction lets you first describe a thing, then identify which thing you mean. 방이 작아요 is a full sentence; 작은 방 is a noun phrase that can become part of a larger sentence. After constructing the phrase, add the outside particle or predicate needed for its role; a particle is a short word attached to the end of a noun to show its role in the sentence. The internal descriptive ending and the external sentence role are separate decisions.

06 / Understand

Connect properties and distinguish contrast

To list compatible descriptions, attach 고 to the first descriptive stem: 크고 밝아요, “is big and bright.” The final predicate carries the polite ending. This is different from the noun modifying form and different from putting two full polite sentences next to each other.

For an explicit contrast, 지만 is useful: 작지만 편해요, “it is small but comfortable.” The connector tells the listener how to relate the two descriptions. Do not choose it merely because the English words are adjectives. Decide whether you are adding another property or presenting a property that contrasts with an expectation.

Background constructions such as 작은데 also occur, but their function depends on the following message and context. This lesson only asks you to recognize that Korean has more than one way to connect descriptions. Reliable production begins with a clear additive 고 sentence and an explicit 지만 contrast. Later lessons can develop the broader background pattern without collapsing all connectors into English and.

07 / Understand

Check the whole description in context

A descriptive sentence still needs understandable reference. The subject or topic can be omitted when both speakers know the object, but a new description may need the noun named. At a room viewing, 밝아요 can refer to the room; in another conversation, the same word could describe something else. Recover the reference before translating.

The choice game alternates sentence predicates, noun modifiers, negatives, and connectors because each position needs a different form. Before answering, ask whether you are finishing a sentence or describing a following noun. Then identify the stem pattern. A correct vowel ending in the wrong grammatical position is still an error.

For production, describe a real object in two full sentences, then combine one property with its noun. Keep the meaning stable while changing the structure. Later, retrieve a regular form and an irregular form without the model. This gives you a practical way to review vocabulary and grammar together instead of memorizing a disconnected list of adjective translations.

Notice the difference

Common mistakes

From understanding to using

Make your own example.

Try these without answer choices. Say your answer aloud or write it below, then compare your reasoning with the model.