～じゃない？・～んじゃない？
Float a guess and invite agreement
You'll be able to soften an opinion into something the listener can confirm or push back on.
このかばん、便利じゃない？
kono kaban, benri janai?
What do you think this sentence means?
This bag is handy, isn’t it?
Seek agreement or offer a tentative thought
Rising ～じゃない？ can ask for agreement, rather than literally denying a statement. ～んじゃない？ often offers an explanatory guess such as “maybe it is…” or “don’t you think…?”
もうバスが来るんじゃない？
mou basu ga kuru n janai?
Don’t you think the bus will be here soon?
Form and use ～じゃない？・～んじゃない？
Before ん, nouns and な-adjectives need な: 休みなんじゃない？ Intonation and context distinguish agreement-seeking from an ordinary negative. These are conversational forms.
この問題、簡単じゃない？
kono mondai, kantan janai?
Isn't this problem easy?
もうバスが来るんじゃない？
mou basu ga kuru n janai?
Don’t you think the bus will be here soon?
今日は休みなんじゃない？
kyou wa yasumi nan janai?
Maybe today is a day off?
このシャツ、似合うんじゃない？
kono shatsu, niau n janai?
Don't you think this shirt would suit you?
空が暗いから、傘を持っていったほうがいいんじゃない？
sora ga kurai kara, kasa o motte itta hou ga ii n janai?
The sky is dark, so wouldn't it be better to take an umbrella?
もう十時だよ。店は閉まっているんじゃない？
mou juuji da yo. mise wa shimatte iru n janai?
It's already ten. Isn't the shop closed by now?
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