-랑, -하고, -과/와
You can use any of these endings to express the idea of ‘with,’ but each one conveys a different level of formality.
랑(이랑)
Most casual and informal. Great for spoken Korean
친구들이랑 스시집에 다녀왔어요
When 랑 is used with objects, as in ordering food, it means
and.
하고
Neural and versatile. Works well in casual or semi-formal contexts.
지난 5월에 친구하고 스시집에 다녀왔어요.
과/와
Formal, often used in writing or official settings.
친구들과 스시집에 다녀왔어요