-(으)ㄹ 수 있다/없다 has two meanings, which are ‘ability’ and ‘possibility’. It can be translated ‘can/can not’ in English. You can add the tense at the end like 있어요/있었어요/있을 거예요.
Verb(consonant) + 을 수 있다/없다
Verb(vowel or ㄹ) +ㄹ 수 있다/없다
For example,
자(다) + ㄹ 수 있어요 = 잘 수 있어요 / 없어요
보(다) + ㄹ 수 있어요 = 볼 수 있어요 / 없어요
살(다) + ㄹ 수 있어요 = 살 수 있어요 / 없어요
먹(다) + 을 수 있어요 = 먹을 수 있어요 / 없어요
읽(다) + 을 수 있어요 = 읽을 수 있어요 / 없어요
Practice>>
| Korean | English |
| 내일 이 편지를 보낼 수 있어요? | Can you send this mail tomorrow? |
| 잠을 잘 수 없어요. | I can’t sleep. |
| 컴퓨터를 끌 수 없어요. | I can’t turn off my computer. |
| 내일 올 수 있어요? | Can you come tomorrow? |
| 그 사람을 믿을 수 없어요. | I can’t trust that person. |
| 오늘 돈을 찾을 수 있어요? | Can you take out money today? |
| 문을 닫을 수 없어요. | I can’t close the door. |
| 여기에서 수영할 수 있어요? 수영할 수 있어요. | Is it okay to swim here? I can swim. (ability) |
You can also listen to the pronunciation here.
If you want to say “can do / know how to do(ability)”, you can use ‘-(으)ㄹ 줄 알다/모르다’ instead of ‘-(으)ㄹ 수 있다/없다’. You can click here to learn more ‘-(으)ㄹ 줄 알다/모르다’.
#을수있다 #을수없다 #을 수 있다 #을 수 없다 #을수있어요 #을수없어요 #ㄹ수있다 #ㄹ수없다 #ㄹ수있어요 #ㄹ수없어요 #(으)ㄹ수있다 #(으)ㄹ수없다 #can in Korean #을수있다/없다 #수있다 meaning #수없다 meaning
Funkorean4u.com 
Hi, I just found your blog and I love it. You explain everything so well, in fact I finally managed to understand many thing that weren’t clear, so thank you!!! But I have a question, in the phrase
잠을 잘 수 없어요. = I can’t sleep, I looked at the dictionary it is possible the both 잠 and 자 means “to sleep”? When I tried to translate together it said “sleep well”, could you please explain this, also sorry for any English error, it’s not my first language. Again, thank you a lot !!!! 화이팅 🙂
안녕하세요. 마리아 씨. Thanks for the reply!
잠 is a noun for sleep and 자다 is a verb for sleep. So they are often used together as well as just 자다.
(잠을) 잘 못 잤어요. Can’t sleep.
(잠을) 잘 자고 싶어요. Want to sleep.
We have several verbs that are like this such as 춤을 추다 and 짐을 지다.
잠, 춤, 짐 are nouns that are derived from verbs and they also use with other verbs such as
잠이 안 와요. Can’t fall asleep.
춤을 배우고 싶어요. Want to learn dance.
짐이 무거워요. The stuff is too heavy.
And 화이팅!!!! 아자아자!!!!