seonsaengnimi sueobeseo jasehi seolmyeonghaeyo.

The teacher explains in detail in class.

Breakdown of seonsaengnimi sueobeseo jasehi seolmyeonghaeyo.

• ~이: subject particle
• ~에서: location particle
• 수업: class
• 선생님: teacher
• 자세히: in detail
• 설명하다: to explain

Questions & Answers about seonsaengnimi sueobeseo jasehi seolmyeonghaeyo.

Why is it 선생님이 and not 선생님가? What does 이 do?

• 이/가 marks the subject. Use 이 after a final consonant and 가 after a vowel.
• 선생님 ends with ㅁ (a consonant), so it takes 이.
• 이/가 often presents or specifies the subject (answers who does the action).

Could I use 선생님은 instead of 선생님이? What changes?

• Yes. Both are correct but with nuance:
  • 선생님이: identifies the subject (who explains).
  • 선생님은: sets the teacher as the topic, often implying contrast or a general habit.

Since it’s a teacher, should I use honorifics like 선생님께서 and add -시- to the verb?

• For extra respect/formality, yes:
  • 선생님께서 수업에서 자세히 설명하세요. (polite honorific)
  • 선생님께서 수업에서 자세히 설명하십니다. (formal honorific)
• The original is fine in everyday polite speech; honorifics sound more respectful/formal.

Why 수업에서 and not 수업에?

• 에서 marks the place/setting where an action happens (in/during).
• 에 marks static location or time; with an action like 설명하다, use 에서.
• Different meaning: 수업에 대해 설명해요 = explains about the class.

Is 수업에서 natural? Are there good alternatives?

• All are natural with slight nuance:
  • 수업에서: in the class setting.
  • 수업 시간에: during class time (time-focused).
  • 수업 때: when it’s class (casual).
  • 수업 중에: while class is in progress (a bit formal).

What is the dictionary form of 설명해요, and how is it built?

• Dictionary: 설명하다.
• Build: 설명하 + 여요 → 설명해요 (standard polite present).
• Common variants:
  • Past: 설명했어요
  • Formal: 설명합니다

Do I need an object after 설명해요?

• No. You can speak generally: 자세히 설명해요 = explains in detail.
• To specify the content, add an object or -에 대해:
  • 문제를 자세히 설명해요 (explains the problem).
  • 과정에 대해 자세히 설명해요 (explains about the course).

What exactly does 자세히 mean? How does it compare with 자세하게 and 상세히?

• 자세히 = in detail, thoroughly (adverb). It’s not about being careful or polite.
• 자세하게 is another adverb form; both work, but 자세히 설명하다 is the more common collocation.
• Adjective: 자세한 (detailed), e.g., 자세한 설명.
• 상세히 also means in detail; sounds a bit more formal/literary.

Can I say 설명을 자세히 해요 instead of 자세히 설명해요?

• Yes. 설명하다 can be split into noun + 하다:
  • 자세히 설명해요 and 설명을 자세히 해요 are both natural; the first is more compact and common.

How flexible is the word order? Is 수업에서 선생님이 자세히 설명해요 okay?

• Yes. Both are fine:
  • 선생님이 수업에서 자세히 설명해요 (neutral).
  • 수업에서 선생님이 자세히 설명해요 (emphasizes the setting).
• Avoid awkward splits like 자세히 수업에서 설명해요; keep the adverb close to the verb.

Does 설명해요 mean explains or is explaining?

• The present -어요 form can mean either; context decides.
• To stress ongoing action, add 지금 or use 설명하고 있어요.

Can I drop particles like 이 and 에서 in casual speech?

• Often dropped when obvious, e.g., 선생님 수업에서 자세히 설명해요 or 선생님 수업 때 자세히 설명해요.
• As a learner, keep particles—they clarify roles and reduce ambiguity.

Should I use 교실에서 instead of 수업에서 if I mean the physical room?

• Use 교실에서 for the physical classroom.
• Use 수업에서 for the class session/event. In many contexts either could fit, but the nuance differs.

Why is there 요 at the end? What are more formal or casual versions?

• -요 (해요체) makes it politely neutral.
• Casual: 설명해.
• Formal: 설명합니다.
• Honorific formal: 설명하십니다.

Any quick pronunciation tips?

• Rough romanization: seonsaengnimi sueobeseo jasehi seolmyeonghaeyo.
• Notes:
  • 에서 sounds like [에서], not [에써].
  • Keep the h sound clear in 자세히.
  • Say 설명해요 smoothly as one unit.