used to say that there is nothing to prevent someone or something from achieving success

한계는 없다, 하늘이 한계다
before the opportunity to do or achieve something passes

기회가 있을 때, 기회가 지나가기 전에
(of something good) to happen or become available to one

찾아오다, 기회가 생기다
to get the feeling that something is about to happen

곧 일어날 듯하다, 기미가 보이다
used for saying if the worst possible or most difficult thing happens

최악의 경우, 정 안 되면
used to say that something bad or unpleasant is going to happen

일이 터질 것 같다, 심상치 않다
used when a situation reaches a critical point and one must take action in order to deal with it

막상 닥치면, 정작 중요한 순간에는
to have a likelihood of success or achieving a desired outcome

가능성이 있다, 승산이 있다
to be able to say or estimate what is about to happen in the future

징후를 읽다, 앞일을 짐작하다
theoretically rather than practically

서류상으로는, 이론상으로는
something that will be troublesome or problematic in the near future

불안한 그림자가 드리우다, 우려스러운 조짐