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いいじゃない vs.いいんじゃない

jellofish

Kouhai
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Hello :)

I am confused about when should I add ん before じゃない

Sometimes I hear people say いいじゃない? 
Sometimes I hear people say いいんじゃない?

I also hear both あるじゃん and あるんじゃん?


Please help me to solve this. :cry:

Thank you very much!
 

Rei Yahya

ぺらぺらになりたい生徒
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There may be a nuance, so wait for someone more experienced to give you an answer, but here's what I know.

This ん is a contraction of the explanatory の. It has an explanatory tone to it. Also, when used at the end of a question, it gives the feeling of seeking an explanation.

「なんでテーブルの下で探してるの?」Why are you looking under the table?
「コンタクトレンズを落としたんだ。」I dropped a contact lens.
 

jellofish

Kouhai
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Thank you for your help Rei~

However, I still do understand the difference between

いいじゃない and いいんじゃない
 

Toritoribe

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It's hard to summarize the difference between the two forms. The meaning depends on whether it's said with a rising intonation or a falling one, or whether what is put before (ん)じゃない is a noun/na-adjective or a(n) verb/i-adjective. Generally, it's said that じゃない?is used for confirmation of things the speaker knows/experienced, and んじゃない? is for things the speaker thinks/guesses.

As for いいんじゃない?, it could sound halfhearted.
 
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jellofish

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Thank you very much again Tori:valentine
Your explanation is as helpful as always:hum:
 
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