Korean ability and possibility with su itda

01 / Understand

Identify the action and the relevant possibility

A sentence such as 수영할 수 있어요 says that swimming is possible for the understood person. In an ordinary skills conversation, that can mean the person knows how to swim. In another setting, the same general construction can concern circumstances, such as whether there is enough time to finish a task. Use the situation to identify the intended kind of possibility.

Do not translate every instance as an unlimited permanent skill. A person might normally be able to read but be unable to read a particular sign because it is too far away. A practical ability statement names the task and, where necessary, a time, place, or other restriction. The ending leaves those details to the surrounding sentence and conversation.

This lesson uses controllable actions with a clear actor. More abstract possibilities also occur, but starting with concrete tasks makes the meaning easier to test. Ask what action is under consideration and what would count as being able to do it. A claim about reading a short menu is narrower than a claim about reading every kind of Korean text.

02 / Understand

Build the modifier before the bound noun su

After a vowel stem, add final ㄹ: 가다 gives 갈 수 있어요. After most consonant stems, use 을: 읽다 gives 읽을 수 있어요. The element 수 is written separately, as is 있어요. The whole sequence works together as a construction; a bare verb followed by su is not enough.

A stem already ending in rieul does not gain a second rieul in this position. 만들다 becomes 만들 수 있어요. Compare this with 만들려고, which belongs to a different construction and contains the following ryeogo ending. Accurate morphology requires recognizing the actual ending, not applying a rule from a superficially similar word.

The form before su resembles the prospective modifier used before ordinary nouns. That connection helps explain why the dictionary ending da and polite ending yo do not remain there. Still, learn the complete ability pattern as a unit of meaning. Knowing the shape of a noun modifier alone does not tell you which following nouns produce an ability construction.

03 / Understand

Negate possibility rather than reporting nonperformance

To say an action is not possible, replace 있어요 with 없어요: 갈 수 없어요, cannot go. The negative targets the possibility expressed by the construction. A simple negative action sentence such as 안 가요 says the person does not go or is not going in the context. It does not necessarily state inability.

This distinction matters when responding to a proposed plan. Someone who cannot attend because of work is explaining a constraint. Someone who is not attending might be making a choice, following a different plan, or facing a constraint that remains unstated. Do not infer the missing reason from the negative action alone.

For first production, keep the negative outside the intended positive action: reading is the task, and the possibility is absent. More complex combinations of negative actions and possibility require careful scope and are unnecessary here. Start with a simple pair that changes only isseoyo to eopseoyo, then explain what the listener can and cannot conclude.

04 / Understand

Keep the verb’s objects and locations

Adding the ability construction does not erase the action’s ordinary participants. In 친구를 만날 수 있어요, the friend remains the object of meeting. In 친구에게 사진을 보낼 수 있어요, the friend is the recipient and the photograph is the object. The ending adds possibility to the event while preserving those relationships.

A place of action normally uses 에서, as in reading at a library. A destination with a movement verb commonly uses 에. The fact that the sentence is about possibility does not make these particles interchangeable. Work from a complete ordinary action sentence, then change its final verb into the ability construction.

Context can license omitted objects or subjects, but omission is easiest to understand after their roles are clear. When practicing a new construction, name the relevant participant at least once. A sentence that is structurally possible but leaves the listener unsure what can be sent or where to meet may fail the practical communication task.

05 / Understand

Separate ability, desire, and intention

갈 수 있어요, 가고 싶어요, and 가려고 해요 answer different questions. The first concerns possibility, the second desire, and the third intention. A person can want to go somewhere without being able to go. A person can also be able to go without wanting or planning to do so.

These distinctions make answers more informative. If someone asks about a practical skill, reporting a wish to learn it does not establish present ability. If someone asks about your plan, reporting possibility leaves the decision open. Choose the construction that matches the information requested rather than treating all three as vague future expressions.

For paired practice, keep the same destination and change only the final construction. Explain how each version changes what the speaker commits to. Then combine two compatible statements, such as wanting to attend but being unable to attend today. The grammar becomes useful when it helps describe a real mismatch between wishes and circumstances.

06 / Understand

Add a reason or a limiting condition

A contrast with 지만 can explain a practical limit: 읽을 수 있지만 잘 이해하지 못해요 would distinguish decoding from understanding, though the shorter models here focus on familiar vocabulary. A learner should avoid an unqualified ability claim when an important limitation changes what others can reasonably expect.

A condition with 으면 or 면 can make possibility dependent on circumstances. 시간이 있으면 만날 수 있어요 means that meeting is possible if there is time. It does not assert that time is available. Treat the condition as part of the statement, not as optional decoration that can be dropped from the translation.

Reasons and simple connections help relate skills to action. When a reason introduces a suggestion or request, the nikka construction is useful; when listing abilities, go can join predicates. Choose the connection by its meaning. This section does not ask you to master every causal restriction, but it does require preserving whether the sentence adds information, gives a reason, or sets a condition.

07 / Understand

Use an ability phrase to identify a person or thing

Before a noun, the final existence predicate becomes a modifier: 읽을 수 있는 책, a book one can read. The inner verb still has its l or eul form before su. The outer 있는 connects the whole possibility expression to the following noun. Do not replace both layers with a single generic adjective ending.

This is useful when selecting a resource matched to a learner’s current ability. A readable book in this context is one the learner can manage, not necessarily one that every person can read. If the relevant reader is unclear, identify that person in the conversation. The noun phrase inherits the context dependence of the original ability statement.

For independent work, write one narrow ability claim, one inability claim, and one condition that affects possibility. Then describe a resource you can use with a noun phrase. On a later day, retrieve vowel, consonant, and rieul stem forms without the model. Check that your sentence claims exactly the ability you mean and no broader guarantee.

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.