가니까

In a sentence

• 기차역에 가니까 문이 닫혀 있었어요.

  When I went to the train station, the doors were closed.

  In this sentence, '가니까' is used to indicate a learned result upon arriving at a location, with '가다' meaning 'to go' combined with '-니까' which implies 'upon arriving/going then.'

• 공원에 가니까 사람들이 운동하고 있었어요.

  When I went to the park, people were exercising.

  Here, '가니까' illustrates the discovery upon arriving at the park. It combines the usage of action (going to the park) and reaction (observing people exercising).

• 가게에 가니까 물건이 다 팔렸어요.

  When I went to the store, all the items were sold out.

  In this context, '가니까' conveys the experience of realizing something happened upon going to the store, highlighting a cause-effect or time relationship.