중

When an action occurs

In English: In the process/middle

Indicate that the subject is in the process of performing an action

• 나는 수업 중이에요. 나중에 전화할게요.

  naneun sueop jungieyo. najunge jeonhwahalgeyo.

  I am in class now. I will call you later.

• 그 건물은 공사 중입니다.

  그 건무른 공사 중임니다.said like thisgeu geonmureun gongsa jungimnida.

  That building is under construction.

See it while you watch

The extension puts the romanization, the speech level and the meaning under every subtitle line. Try it on your own sentence.