What is the difference between その人が買うんじゃなかったの？ and その人が買うんじゃなかった？ and その人が買わなかったんだ？?
Feel free to just provide example sentences.

Also, what is the polite version of this ?

Answers

Deleted user

Because it is colloquial, it is only the difference of accent. All meanings are the same.　:)

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Deleted user

@1000spring Oh, really ? That's a good thing then ^^ Thank you for your answer !
If I may ask, what should I say if I want to sound polite ?

Deleted user

I can not use the audio right now. sorry. Good luck :)

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Deleted user

@1000spring Don't be sorry, it's nothing ! I meant, the written version, but I'll search a little bit ^^
ありがとうございます !

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Deleted user

Ah. I was misunderstanding. Thank you. good luck :)

What is the difference between その人が買うんじゃなかったの？ and その人が買うんじゃなかった？ and その人が買わなかったんだ？?Feel free to just provide example sentences.