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じゃないか (ja nai ka) Meaning Japanese Grammar - Isn't It?

Author Anna Baffa Volpe for article 'じゃないか (ja nai ka) Meaning Japanese Grammar - Isn't It?'

Anna Baffa Volpe

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じゃないか (ja nai ka) Meaning Japanese Grammar - Isn't It?

The structure じゃないか (janaika) is a negative interrogative form and means isn't it?, right?.

It is preceded by nouns, adjectives and verbs.

In this post we learn more about the meaning of じゃないか, how it is formed and when じゃないか is used through real example sentences.


How and when to use じゃないか

This structure is used to express emotions such as surprise at something unexpected, but also blame and anger depending on the situation.

With this form you also ask your interlocutor for confirmation of what you are saying.

It is true, isn't it? Right?

Expression: いいじゃないか: Why not? It's fine, isn't it?, Never mind.

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いいじゃないか? It's good, isn't it?

まちがったっていいじゃないか。

It doesn't matter if you're wrong.

How じゃないか is formed

じゃないか is formed:

  • by じゃない or ではない, negative forms of the copula だ
  • and by the interrogative particle

ではないか is more formal than じゃないか.

Noun+じゃないか

()(けい)() refers to recession, crisis and (えい)(きょう) means influence, effect, impact

これは()(けい)()(えい)(きょう)ではないか。

This is the recession’s effect, isn't it?

Adjective in い+じゃないか

(たか)Adjective in い, means high, expensive, expensive

このレストランは(たか)いじゃないか。

This restaurant is expensive, isn't it?

Adjective in な without な+じゃないか

()(てき)Adjective in な means beautiful, magnificent, splendid

Title of a CD by The Beach Boys: 『Wouldn't It Be Nice』

Isn't that lovely?
()(てき)な: beautiful, nice

()(てき)じゃないか。

Wouldn't it be nice?

(じゅう)(ぶん)な means enough, sufficient

もう(じゅう)(ぶん)じゃないか?

Isn't that enough?

Verb+じゃないか

(りょう)()(ぜん)()一人(ひとり)(つく)ったじゃないか。

You did all the cooking by yourself, didn't you?

With adjectives ending in い and verbs we often find the form んじゃないか.

いやな(かぜ)だ。(たい)(ふう)()るんじゃないか。

It's a nasty wind, isn't there a typhoon coming?

(かれ)(はな)(かた)から(かれ)()(しゃ)ではないかと(おも)った。

The way he spoke made me think he was a doctor.

Volitive / exhortative form and じゃないか

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Examples of じゃないか

(ぜん)(ぜん)(でん)()がつながらない。もしかして(ばん)(ごう)()(ちが)っているのではないか。

I can't get through on the phone at all. Perhaps the number is wrong.

その(ぎゃく)じゃないか?

Isn't it the opposite?

コンピュータを(こわ)してしまったじゃないか。

You broke your computer.

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