~ㄹ/을 수 있다

§ Understanding the Basics

The Korean modal expression '~ㄹ/을 수 있다' is equivalent to 'can' or 'to be able to' in English. It's used to express ability, possibility, or permission. This is a crucial phrase for beginners, as it allows you to talk about what you are capable of doing. Let's break down how to use it.

§ Conjugation Rules

The conjugation of '~ㄹ/을 수 있다' depends on whether the verb stem ends with a consonant or a vowel.

Rule 1

If the verb stem ends with a vowel, attach '~ㄹ 수 있다'.

For example:

• 가다 (to go) → 가 + ㄹ 수 있다 → 갈 수 있다 (can go)
• 보다 (to see) → 보 + ㄹ 수 있다 → 볼 수 있다 (can see)
• 하다 (to do) → 하 + ㄹ 수 있다 → 할 수 있다 (can do)

Rule 2

If the verb stem ends with a consonant, attach '~을 수 있다'.

For example:

• 먹다 (to eat) → 먹 + 을 수 있다 → 먹을 수 있다 (can eat)
• 읽다 (to read) → 읽 + 을 수 있다 → 읽을 수 있다 (can read)
• 듣다 (to listen) → 들 + 을 수 있다 → 들을 수 있다 (can listen)

Irregular Verbs

Be aware of irregular verbs, especially those ending with 'ㅂ' or 'ㄷ'. These often change when followed by a vowel. For instance, 돕다 (to help) becomes 도울 수 있다 (can help), and 짓다 (to build) becomes 지을 수 있다 (can build).

§ Usage in Sentences

Let's look at some practical examples to see how '~ㄹ/을 수 있다' works in context.

This translates to: I can speak Korean. (Here, 말하다 (to speak) ends with a vowel, so '~ㄹ 수 있다' is used.)

This translates to: I can eat spicy food. (Here, 먹다 (to eat) ends with a consonant, so '~을 수 있다' is used.)

This means: Can you read this book? (Here, 읽다 (to read) ends with a consonant.)

§ Expressing Inability: ~ㄹ/을 수 없다

To express 'cannot' or 'to not be able to', simply replace '있다' with '없다'. The conjugation rules for '~ㄹ/을' remain the same.

This means: I cannot swim. (Here, 하다 (to do) becomes 할 수 없어요.)

This translates to: I cannot go now. (Here, 가다 (to go) becomes 갈 수 없어요.)

§ Common Uses and Contexts

This expression is very versatile. You'll hear and use it constantly in everyday conversations.

• Ability: To state what you are capable of doing.
• Possibility: To discuss if something is possible or not.
• Permission: To ask or state if something is allowed.

This means: Can I sit here? (Asking for permission; 앉다 (to sit) ends with a consonant.)

This means: Can you help me now? (Asking if someone is able to help; 돕다 (to help) becomes 도와주다 (to give help), which ends with a vowel.)

§ Practice Makes Perfect

The best way to get comfortable with '~ㄹ/을 수 있다' is to practice using it in sentences. Try to form your own sentences about what you can and cannot do. Think about your hobbies, your skills, or even simple daily actions.

• What can you do today?
• What can't you do right now?
• What can you do in Korean?

§ Understanding ~ㄹ/을 수 있다

You're learning Korean, and that's great! Today, we're looking at a super useful phrase: ~ㄹ/을 수 있다. This means 'can' or 'able to'. It's essential for talking about abilities, possibilities, and permission. Let's break it down.

DEFINITION

~ㄹ/을 수 있다 means 'can' or 'to be able to'. It attaches to the end of a verb stem.

§ ~ㄹ/을 수 있다 in Daily Life

This isn't just a grammar point in a textbook. You'll hear and use ~ㄹ/을 수 있다 all the time. It's fundamental for expressing capabilities, making requests, and understanding what's possible. Let's look at some real-world situations.

§ At Work

In a work setting, you'll often use this to talk about tasks, skills, and availability.

Translation hint: I can do this project.

Translation hint: Can you work overtime this evening?

Translation hint: Where can I find that document?

§ At School

Whether you're a student or a teacher, you'll use this to discuss learning, understanding, and possibilities.

Translation hint: I can give a presentation in Korean.

Translation hint: Are there any students who can solve this problem?

Translation hint: Can I submit the homework by tomorrow?

§ In the News or General Discussions

When reading news or listening to conversations, you'll hear ~ㄹ/을 수 있다 to talk about possibilities, potential outcomes, and general abilities.

Translation hint: With new technology, we can do more things.

Translation hint: Can we watch a movie after dinner?

Translation hint: We will be able to find a solution to this problem.

§ Common Uses and Nuances

While the core meaning is 'can/able to', there are subtle ways it's used:

• Ability: Expressing what someone is capable of.
• Possibility: Indicating that something might happen or is feasible.
• Permission: Asking if it's okay to do something (though other expressions are often more direct for permission).

§ Practice Makes Perfect

The best way to master ~ㄹ/을 수 있다 is to use it. Try making sentences about what you can do, what you can't do, or what's possible in your day-to-day life. The more you use it, the more natural it will become!

§ Similar words and when to use this one vs alternatives

When you want to express "can" or "able to" in Korean, ~ㄹ/을 수 있다 is your go-to phrase. It's super versatile. However, there are a few other ways to express similar meanings, and knowing the differences will make your Korean sound more natural.

§ The Core: ~ㄹ/을 수 있다

~ㄹ/을 수 있다 literally means "there is a possibility/ability to do something." It covers both physical ability and circumstantial possibility.

FUNCTION

Expresses ability or possibility.

HINT

I can speak Korean.

HINT

It might rain today. (Literally: Rain can come today.)

§ Alternative: ~해도 되다 (Permissibility)

While ~ㄹ/을 수 있다 talks about ability or possibility, ~해도 되다 is about *permission*. It means "it's okay to do" or "you may do."

FUNCTION

Expresses permission.

HINT

You may sit here. / It's okay to sit here.

You wouldn't use ~ㄹ/을 수 있다 here because you're not talking about the ability to sit, but whether it's allowed.

• 여기 앉을 수 있어요? (Can I sit here? - asking about possibility/ability, might sound a bit awkward if asking for permission)
• 여기 앉아도 돼요? (May I sit here? - asking for permission, this is natural)

§ Alternative: ~가능하다 (Formal Possibility/Feasibility)

~가능하다 (to be possible/feasible) is often used in more formal contexts or when discussing the feasibility of something rather than a personal ability. It's usually attached to nouns, or the gerund form of a verb (~는 것).

FUNCTION

Expresses possibility or feasibility in a more formal way.

HINT

Reservation changes are possible.

HINT

Departing now is possible.

While you could also say 지금 출발할 수 있어요, using 가능하다 adds a slightly more formal or objective tone, focusing on the feasibility of the action rather than someone's personal ability.

§ Verb + -지 못하다 / 못 + Verb (Inability)

To express inability, the direct opposite of ~ㄹ/을 수 있다 is ~ㄹ/을 수 없다. However, you'll also frequently hear ~지 못하다 or 못 + Verb.

FUNCTION

Expresses inability or impossibility.

• ~ㄹ/을 수 없다: The most direct opposite of ~ㄹ/을 수 있다, covers both physical inability and circumstantial impossibility.
• ~지 못하다: Often used when the inability is due to an external factor or a lack of skill.
• 못 + Verb: A shorter, more casual way to express inability, often implying the speaker *couldn't* do it even if they wanted to, due to external circumstances.

HINT

I cannot swim. (Lack of ability)

HINT

I couldn't finish my homework because I didn't have time. (External circumstance)

HINT

I can't speak Korean well yet. (Lack of skill)

§ Key Takeaways

• Use ~ㄹ/을 수 있다 for general ability and possibility.
• Use ~해도 되다 for permission.
• Use ~가능하다 for formal possibility/feasibility.
• Use ~ㄹ/을 수 없다, ~지 못하다, or 못 + Verb for expressing inability.

Understanding these nuances will significantly improve your Korean communication. Keep practicing, and you'll get the hang of it!