In the Middle of (-는 중)

-는 중 expresses that an action is currently underway. 중 means 'middle' or 'during', and combined with -는, it emphasizes that the action is happening right now. 공부하는 중이에요 means 'I am in the middle of studying'.

This pattern is slightly more emphatic than -고 있다. While -고 있다 simply states an ongoing action, -는 중 stresses that the person is currently occupied with the activity and perhaps should not be interrupted. It is commonly used to explain why you cannot do something else.

With nouns, use 중 directly: 회의 중 (in a meeting), 식사 중 (during a meal), 통화 중 (on the phone). These noun + 중 combinations are extremely common in everyday Korean and on signs.