particle N3 common casual

ぞ — forceful assertion

ぞ

Meaning

sentence-final ぞ — adds force: self-directed resolve or a strong warning/assertion to others

Key sentence

よし、行いくぞ。

All right, here I go!

Formation

Attaches to	Form	Example
End of a plain-form sentence	[plain sentence] + ぞ	やるぞ / 危あぶないぞ / 負まけないぞ

When: Rough and assertive, used by men in casual speech, or by anyone psyching themselves up. Out of place in polite or mixed-company conversation.

Examples

そんなことをすると、後あとで困こまるぞ。

If you do that, you'll be in trouble later, I'm telling you.

今日きょうこそ最後さいごまでやり遂とげるぞ。

Today I'm definitely going to see it through!

Easily confused with

よよ informs the listener of something they may not know, in any register; ぞ is blunter and more masculine — either firing yourself up (self-talk) or pushing an assertion/warning hard at the listener.

Notes

ぜ is a close, slightly lighter sibling aimed at the listener (行いくぜ); ぞ works equally for resolve muttered to oneself. Both are markedly rough and casual.

See ぞ in real sentences

Jengo shows ぞ the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.

Study it in Jengo

Sources Compiled with reference to A Dictionary of Intermediate Japanese Grammar.

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