The following structure is used to say: I can't -Verb- Verb+ㄹ/을 수(가) 없다 지금 이얘기할 수(가) 없어요. I can't talk right now. 밥이 없어서 요릴 수(가) 없어요. There's no food so I can't cook. 1. First you have to drop 다 and add 을 (if the verb ends with a consonant) ㄹ(if the verb ends with a vowel) To go 가다 //// 갈 To live 살다 //// 살 (If the vowel ends with ㄹ you only drop 다) To eat 먹다 //// 먹을 2. 수 literally means "way, capability" and is the verb 없다 "not to be". So this would take the meaning as: No to have a way to - Verb (But nowadays translated as ---> Cannot - Verb). And 가 is a particle but it's not necessary to use it.

Thanks a lot. I think i'm starting to understand it and all your answer are very helpful :3

it means i can't open my eyes. we usually use some situation when is very pricking and very sleepy, tired like that i hope you understanding what im saying :)

뜨다 when used with 눈 it means = to open (one's eyes), wake up, awake http://dic.daum.net/word/view.do?wordid=kew000021544&q=%EB%9C%A8%EB%8B%A4&page=2