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I found this usage of じゃない. Perhaps the translation is too loose in meaning.

> A: Is your girlfriend cute?
>
> B: Why wouldn't she be?
>
> A: 君の彼女、かわいい？
>
> B: かわいいに決まってるじゃない。

Does "かわいいに決まってるじゃない" mean the same thing as "かわいいに決まってる," just with more
emphasis?

Is the following reasoning therefore correct?

いいね。→いいじゃない。→いいじゃん（Tokyo dialect）。

きれいね。→きれいじゃない。→きれいじゃん（Tokyo dialect）。

大きいね。→大きいじゃない。→大きいじゃん（Tokyo dialect）。

Or is there a different nuance by using the negative form?

Furthermore, I suppose inferring the speaker's intentions come from context
and the lilt in the speaker's voice, as in the following:

大きいね。Wow, it's big.

大きいじゃない。 It's big, isn't it.

大きいじゃん。 Damn, it's big.

Though without context, " 大きいじゃない。" simply means, "It's not big."

Correct?

*Bonus question:

In English, if my translation is correct, the sentence,

> 大きいじゃない。
>
> It's big, isn't it?

should have a question mark. However, in Japanese, is it not required?
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2013-05-20T02:52:05.570
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grammar dialects
Questions on a usage of じゃない
[I've also just noticed this question has come up before (See: Usage of ～じゃん
(～じゃない))but you can read my answers anyway - I am going to check them!]

Q1: Does "かわいいに決まってるじゃない" mean the same thing as "かわいいに決まってる," just with more
emphasis?

> _A1: Yes (but I see from the previous answer it can often be translated as
> "Actually")_

Q2: Is the following reasoning therefore correct?

> _A2: Yes but see on to next answer (A3)_

Q3: I suppose inferring the speaker's intentions come from context and the
lilt in the speaker's voice[?]

> _A3: In principle as you say context and spoken intonation are important but
> (as I think you know very well) the literal meaning of きれいじゃない is "[she is]
> not pretty" and depending on how you saying it 大きいじゃない can mean either
> (atthe end of the phrase rising intonation=>emphsis, falling intonation=>
> contradiction/denial)_

Q4: Question marks; are they not required in Japanese?

> A4: No they are not traditional Japanese characters although these days
> people may use them because they are well understood. I think this is most
> common in dialogues or less formal text (eg speech bubble)

Note: I have always understood ~じゃんか to be Yokohama. Not 100% sure about ~じゃん
but expressions like いいじゃん feel pretty every day up here in Tokyo.
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