verb + ~지 못하다 (~ji motada)

verb-지 못하다’ is used when the subject has an intention to do something, but the subject cannot do something because of his/her inability to do or some kind of external situations.

For example, ‘아침을 먹지 못했어요. I could not have breakfast. 바빴어요.’ I was busy. I wanted to have breakfast. But I was busy.