Used to provide an explanation, state a reason, or seek clarification. Plain form + んです (e.g., 行くんです). I-Adjectives: Plain form + んです (e.g., 忙しいんです). Na-Adjectives/Nouns: + んです (e.g., 暇なんです / 休みなんです). ～ていただけませんか (~te itadakemasen ka): A more polite version of ~te kudasai , translated as "Could you please...?".
Renshuu B applies this specifically to sentences involving motion verbs (ikimasu, kimasu, kaerimasu) or transfer verbs (okurimasu, dashimasu), asking is doing the action. Minna No Nihongo Lesson 26 Renshuu B Answers
→ Permission. Polite refusal: いけません (must not) – stronger than だめです. Used to provide an explanation, state a reason,
in the Renshuu B section that you'd like me to explain further? Used to provide an explanation
) : Used to ask for advice or instructions (e.g., "What should I do?"). Renshuu B Answers & Explanations Exercise 1: Identifying Situations (～んですか)