This word makes your sentence sound very strong. You use it when something is very clear to you. It can show surprise or that you were right.
Clause [plain form] + じゃんかPrimary
This word makes your sentence sound very strong. You use it when something is very clear to you. It can show surprise or that you were right.
ほら、言ったじゃんか！ちゃんと聞けよ。
See, I told you, didn't I?! Listen properly!
え、明日のテスト、勉強してないの？昨日あれほど言ったじゃんか。
What, you haven't studied for tomorrow's test? I told you so many times yesterday, didn't I?!
このフィギュア、めっちゃ高いじゃんか！手が出ないよ。
This figure is crazy expensive, isn't it!? I can't afford it.
なんでやらないんだよ。やればできるじゃんか。
Why aren't you doing it? You can do it if you try, can't you!
「だから言ったじゃんか」って顔でこっちを見るなよ。
Don't look at me with that 'I told you so' face.
This word makes you sound like a tough guy. It was popular with rebellious young people. Using it can make you seem strong or a bit rough. It is mostly used by men.
This is different from "〜じゃないか". That phrase can be polite or informal. "〜じゃんか" is always informal. It is also stronger than "〜じゃん". "〜じゃん" just points something out. "〜じゃんか" says "I told you so!" or "Why didn't you know this?"
Don't use this when you need to be polite. For example, don't use it when talking to your boss. This phrase is very casual. It can sound rude. Only use it with close friends. Use it when you are upset. Or when you are arguing.
Use this when you want to say something is very clear. You might feel a bit annoyed. Or you might want to say "I told you so."
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