sueobeul deutdaga gapjagi inteonesi kkeunhgyeosseoyo.

While attending the class, the internet suddenly got disconnected.

Breakdown of sueobeul deutdaga gapjagi inteonesi kkeunhgyeosseoyo.

• ~이: subject particle
• ~을: object particle
• 듣다: to listen
• 수업: class

Questions & Answers about sueobeul deutdaga gapjagi inteonesi kkeunhgyeosseoyo.

What does 수업을 듣다가 mean, and how does -다가 function here?

수업을 듣다 literally means “to attend a class” or “to listen to a lecture.” When you attach -다가 to a verb stem, it indicates that the first action was in progress and then something else happened (often unexpectedly).

• 수업을 듣다가 → “While I was attending class…”
  It sets up background action 1 (attending class) and leads into action 2 (internet got cut).

How is -다가 different from -고 있었다(가) or -고 있다?

• -고 있다 simply marks a continuous/progressive state:
  “수업을 듣고 있어요.” → “I’m attending class.”
• -고 있었다 is its past counterpart:
  “수업을 듣고 있었어요.” → “I was attending class.”
• -다가, on the other hand, emphasizes that while that action was happening, something else interrupted or followed:
  “수업을 듣다가 친구가 왔어요.” → “While I was in class, my friend came.”
  Use -다가 when you want to highlight the interruption or shift from action 1 to action 2.

Why is the subject omitted in 수업을 듣다가? Who is doing the listening?

In Korean, if the subject is clear from context (especially I or we in daily conversation), you can drop it. Here, the speaker is obviously talking about themselves:

• (저는) 수업을 듣다가… → “(I) was attending class and…”
  Omitting the pronoun makes it more natural and less repetitive.

What part of speech is 갑자기, and what’s its role in this sentence?