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I'd like to know if I can put ～じゃん at the end of every adjective, if there are
any exceptions to that usage, and if it's different from ～じゃない.

**Adj (na) + じゃん**

> 便利 **じゃん**
>
> 便利だった **じゃん**
>
> 便利じゃない **じゃん**
>
> 便利じゃなかった **じゃん**

**Adj (i) + じゃん**

> 楽しい **じゃん**
>
> 楽しかった **じゃん**
>
> 楽しくない **じゃん**
>
> 楽しくなかった **じゃん**

Is this possible? Wouldn't the correct way would be 楽しくない instead of 楽しいじゃん?

**Verb + じゃん**

> ある **じゃん**
>
> やる **じゃん**
>
> いる **じゃん**
>
> くる **じゃん**
>
> ...
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grammar usage verbs colloquial-language adjectives
Usage of ～じゃん (～じゃない)
The first thing to understand here is that じゃん forms a [tag
question](http://en.wikipedia.org/wiki/Tag_question), so it's entirely
different than the negative form:

> このゲームは楽しい。 This game is fun.
>
> このゲームは楽しいじゃん。 This game is fun, isn't it?
>
> このゲームは楽しくない。 This game isn't fun.
>
> このゲームは楽しくないじゃん。 This game isn't fun, is it?

じゃん is an informal version of じゃない; this use of じゃない as a tag question was
[covered by Tsuyoshi Ito
previously](https://japanese.stackexchange.com/questions/453/expression-in-
spoken-japanese/505#505).

Since 形容詞 (けいようし; "い-adjectives") have different conjugation patterns than
形容動詞 (けいようどうし; "な-adjectives"), you can easily tell when a tag question is
being used. But you know that with 形容動詞, じゃない may be present in the negative
form. Without additional context, the following could be ambiguous:

> 便利じゃない。 It's not convenient. **Or** , It's convenient, isn't it?

In this example, intonation distinguishes tag questions from negatives: a tag
question will put a rising intonation on じゃない, while a negative will put a
falling intonation on じゃない. (じゃん, however, is always a tag question and never
forms a negative.)

In writing, this ambiguity can be cleared up by using a question mark or the
question particle か:

> 便利じゃない？ It's convenient, isn't it?
>
> 便利じゃないか。 It's convenient, isn't it?

Additionally, it's worthwhile to discuss here the difference between じゃない
(じゃん) as a tag question and the sentence-ending particle ね:

> あの映画、けっこうおもしろかったね。 That movie was pretty good, wasn't it?
>
> あの映画、けっこうおもしろかったじゃん。 That movie was pretty good, wasn't it?

With ね, the speaker is merely making a statement and anticipating the listener
will agree, but じゃん can often imply that the speaker wants to convince the
listener to agree. In the above example, you would use the first sentence
after seeing a movie with a friend without any prior expectation of how good
the movie would be. But the second is more appropriate if, for example, your
friend went into the movie thinking it would be bad, and after seeing it, you
wanted to get him to agree with you that it was in fact a good movie.
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2011-06-24T20:19:11.493
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じゃん sometimes means 'actually'. For example できるじゃん。= actually you can do it.

and we use it with past-capable form. I don't know how to explain it but it's
like "Actually we could play there = そこで(there) 遊べた(could play)
じゃん(actually)).

It is not a formal saying. So don't use じゃん when you are talking to someone
formally, and you can put it no where but at the end of the sentence.
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answer
じゃん is the colloquial contraction of じゃない. You can use the former (in an
informal context) anywhere you'd use the latter.

As @Hikari pointed out じゃない effectively has the meaning of "actually" in many
cases. But more generally, it can be seen as a marker for rhetorical
questions. I find a good way to think about it, is as a softer equivalent to
"isn't it/doesn't it/etc" in English.

```

    いいじゃん → いいじゃない → "it's ok[, isn't it?]"
    あるじゃん → あるじゃない → "there is[, right?]"/"there's some[, right?]"
    
```

You could also see it as a gender-neutral, _casual_ , equivalent to female-
speech かしら.

I was often told じゃん is more commonly used in Kanto (and even some specific
regions of it), but not to the extent where you could call it a regionalism: a
lot of people everywhere use it in their casual conversation.

**Post-merge update:** there is no strong distinction between the use of 'じゃん'
after verbs or adjectives (very possibly because the whole 'verb'/'adjective'
dichotomy isn't as clean in Japanese as you would expect, coming from
English). In both case, it has the aforementioned use of adding a rhetorical
question inflection...

Regarding 楽しくない vs 楽しいじゃん:

Both are grammatically correct, with different nuances...

Roughly:

```

    楽しくない？ → "aren't you having fun?" (or "Isn't it fun?" etc.)
    
    楽しいじゃん　→ "this is fun, isn't it"
    
```

`じゃん` makes the [rhetorical] questioning much softer. More like a way of
saying "I think this is fun, don't you?". Whereas `楽しくない？` is a more direct
question.
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answer