particle N5 essential casualpolite

よ — asserting / informing (~, you know)

よ

Meaning

~, you know / I'm telling you ~ — presents the statement as news or a point the listener may not have

よ flags the sentence as information the listener lacks. Depending on tone it can be helpful (knock-knock, 落おちたよ) or pushy (違ちがうよ), so it lands harder than a bare statement.

Key sentence

電車でんしゃが来きたよ。

The train's here!

Formation

Attaches to	Form	Example
End of a sentence	… + よ	行いくよ / 大丈夫だいじょうぶですよ

Examples

その映画えいが、面白おもしろいよ。

That movie's good, you know.

鍵かぎを忘わすれているよ。

You're forgetting your keys (I'm telling you).

心配しんぱいしなくても大丈夫だいじょうぶだよ。

It's fine, you don't need to worry.

Easily confused with

ねよ asserts information the listener doesn't have; ね seeks agreement on something already shared. Sending news → よ; checking a shared feeling → ね.

Notes

Combined as よね, they soften an assertion into 'right?': 明日あしただよね = 'it's tomorrow, isn't it?' — you assert but still invite confirmation.

See よ in real sentences

Jengo shows よ 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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