갔는데

In a sentence

• 나는 어제 시장에 갔는데 물건이 너무 비쌌어요.

  I went to the market yesterday, but the items were too expensive.

  In this sentence, 갔는데 ([I] went, but) is used to indicate a contrast or continuation where the visit to the market leads to the realization of the high prices.

• 공원에 갔는데 사람들이 많이 있었어요.

  I went to the park, and there were many people.

  Here, 갔는데 ([I] went, and) is used to connect the event of going to the park with the observation of a crowded park.

• 식당에 갔는데 문이 닫혀 있었어요.

  I went to the restaurant, but it was closed.

  In this case, 갔는데 ([I] went, but) implies an unexpected situation where the intention to visit the restaurant faces a closing.