文末表現N3
〜じゃん・〜じゃない
isn't it...? / right? (confirmation/assertion)
Structure
句子（普通形）+ じゃないか / じゃん
Explanation
The casual contraction of じゃないか, じゃん expresses confirmation, assertion or seeking agreement, "isn't it...?". Attaches to plain sentences (結構じゃん).
Examples
この店のラーメン、結構おいしいじゃん。
This shop's ramen is pretty good, isn't it?
やってみれば、できるじゃないか。
If you try it, you can do it, can't you?
Note
じゃん is a casual contraction for close settings; じゃないか can also express a rhetorical question or exclamation.