N4-G-048
Noun + の ばあいは (In the case of [Noun])
Supporting / Expressing Contingency & Conditions
👀 Layer A: Visual Guide
📝 Quick Summary
This grammar pattern connects a Noun to ばあいは by attaching the particle の (no) to set up a specific conditional scenario or contingency. It translates to “In the case of [Noun]…” or “In the event of [Noun]…” and is frequently used in official instructions, emergency manuals, and rules.
Structure: [Noun] + の + ばあいは
Example 1: かじの ばあいは、119ばんに でんわして ください (In the event of a fire, please call 119).
Example 2: じしんの ばあいは、エレベーターを つかわないで ください (In case of an earthquake, please do not use the elevator).
🔍 Layer B: Deepening
💡 Raya’s Hack
The Complete BAAI Family Rule!
Because baai (場合) acts as a regular noun meaning “case/situation”, Nouns modify it using standard noun-modifying rules with の (no):
– Nouns: 火事 の 場合 (kaji no baai – in case of fire)
– Verbs (Plain): 遅れた 場合 (okureta baai – in case of delay)
– い-adjectives: 悪い 場合 (warui baai – in case it is bad)
– な-adjectives: 必要な な 場合 (hitsuyou na baai – in case it is necessary)
Never use だ (da) before baai!
🚧 Joy’s Mistake
Scene: Joy is creating an emergency safety poster for the dorm.
Joy: 「かじ だ ばあいは、119ばんに でんわして ください。」
(Kaji da baai wa, hyakujyuukyuuban ni denwa shite kudasai.)
❌ Used “da” before ばあい!
Why?
Joy attached the plain copula da directly before baai wa. To modify a noun like baai with another noun, you MUST connect them using the particle の (no).
Correct: 「かじ の ばあいは、119ばんに でんわして ください。」 (In the event of a fire, please call 119.)
🔥 Layer C: Retrieval Practice Loop
Retrieve and apply! Express conditions with Nouns. (Hiragana and English only)
Level 1: Structure Building (Noun + の ばあいは)
Q1. In the event of a fire (かじ)
Q2. In case of rain (あめ)
Q3. In the event of an earthquake (じしん)
Q4. In case of an emergency (きんきゅう)
Q5. In case of a typhoon (たいふう)
Level 2: Full Sentences
Q6. In the event of a fire, please call 119. (かじ / 119ばんに でんわして ください)
Q7. In case of rain, the event is canceled. (あめ / ちゅうしです)
Q8. In the event of an earthquake, please do not use the elevator. (じしん / エレベーターを つかわないで ください)
Q9. In case of an emergency, please press this button. (きんきゅう / この ボタンを おして ください)
Q10. In case of a typhoon, please do not go outside. (たいふう / そとに でないで ください)
