What does 긔 do to the meaning of a word when it is added at the end? An example I saw was in a YouTube video and it said, "검색하기 없긔". The English subtitles under it said this means "no googling please".

Do these sentences make sense? 이 문장들 고쳐주세요.<-- 이거 도 맞지 않으면 고쳐주세요. 그 여자가 영화를 보면서 나한테 계속 얘기해요. - While watching a movie that woman kept talking to me. 잠이 많이 자면 피부가 예뻐질 것 같아요. - It seems that if you sleep a lot your skin will become pretty. 의사 선생님이 지금은 집에 갈 수 있다고 했어요. - The doctor said I can go home now. 그 남자가 나만 게속 보고 있어요. - That man keeps looking only at me. 고마워요!!

Did I write this sentence correctly? 그 남자가 안 도움이 되는 사람 것 같아요. I'm trying to say, "It seems like that man is not a helpful person."

Does this sentence make sense? 세계의 언어를 중에서 한국어 제일 아름다워요. - Among the languages of the world, Korean is the most beautiful.

What does '좀 퍼갈께요' mean? I couldn't find a meaning anywhere. Is this slang?

Is this sentence correct? 나는 그녀가 무슨 말을 다 알고 있어요. - I understand everything that girl is saying.

Does this make sense? 너는 안경이 필요 안돼요? - Don't you need glasses?

Is this sentence correct? 왜냐하면 우리는 졸업하기 전에 1년 결심합니다. I am trying to say, "Because we have one year before graduation to decide."

Is this sentence correct? 한국어 이야기 할 수 있었으면 좋겠어요. - I wish I could speak Korean.