sueop junge hyudaeponeul sseumyeon seonsaengnimeul banghaehaeyo.

If you use your cell phone during class, you disturb the teacher.

Breakdown of sueop junge hyudaeponeul sseumyeon seonsaengnimeul banghaehaeyo.

• ~을: object particle
• 수업: class
• 선생님: teacher
• 휴대폰: cell phone

Questions & Answers about sueop junge hyudaeponeul sseumyeon seonsaengnimeul banghaehaeyo.

What does 수업 중에 mean, and how is it different from 수업에 or 수업 동안?

수업 중에 means “in the middle of class / during class.”

• 중(에) = in the middle of / during (focuses on the class being in progress)
• 수업에 usually means “to/at class” (location/destination/attendance), not “during.”
• 수업 동안 also means “during class,” but it feels a bit more like “for the duration of class” (time-span focus).
  So 수업 중에 is a very natural way to say “while class is going on.”

Why is it 중에 and not just 중?

Both exist, but they behave a little differently:

• 수업 중 = “during class” (more noun-like; often used before another noun or as a time phrase)
• 수업 중에 = “during class” with 에 adding a clear time/occasion marker, making it sound more like “at the time of / while.”
  In everyday speech, 수업 중(에) are both common. 중에 often sounds a bit more explicit as a time expression.

What’s the role of the particle 에 in 수업 중에?

Here 에 marks a time point/occasion: “at/during (the time of) class.”
It’s the same 에 you see in time phrases like 아침에 (in the morning), 주말에 (on the weekend).

Why is it 휴대폰을? What does do here?