-기가 무섭게When you say that something happens right after you do something, or even “as” you are doing it, you can say "verb + this ending"
-기가 바쁘게ending almost always interchangeable with -기가 무섭게
-기는Verb ending used when you want to make sentences like “I DID do it, but...” or “I DO like it, but...”
-기만 하면As long as...(Original literal translation = “if + S + only + V”)
-길래Verb ending that is used when you are talking about (1) doing something as a result of observation, (2) doing something as a result of judging a situation and (3) asking the reason/background