Use 知らせる to pass information to someone, from a change of plans to an exam date.
The idea
知らせる is an ichidan verb meaning “inform” or “let someone know.” Mark the recipient with に and the information with を; a whole fact can be followed by ことを. Drop る before ます or て.
| Dictionary form | Polite non-past | Polite past | て form |
|---|---|---|---|
| 知らせる | 知らせます | 知らせました | 知らせて |
Examples
- 先生は学生に試験の日を知らせます。The teacher informs the students of the exam date.
- 変更があったら、私に知らせてください。If there is a change, please let me know.
- 母に無事に着いたことを知らせました。I let my mother know that I arrived safely.
- 会社は新しい予定をメールで知らせました。The company announced the new schedule by email.
- 結果はまだ本人に知らせていません。I have not yet informed the person concerned of the result.
- 時間が決まったら、みんなに知らせます。Once the time is decided, I will let everyone know.
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Watch out
知らせる describes communicating information; 知る means to know or learn it. Do not confuse the recipient marked by に with the information marked by を.
Try it yourself
友達＿予定を知らせます。（に／を）
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に
に marks the friend as the recipient of the information.
＿。（知らせる→ます）
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知らせます
知らせます is the polite non-past: remove る and add ます.
＿。（知らせる→て）
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知らせて
知らせて is the て form: remove る and add て.
Practice round
Answer questions, then rebuild Japanese sentences where available. We keep your score.
友達＿予定を知らせます。（に／を）
＿。（知らせる→ます）
＿。（知らせる→て）
Tap the words in the right order.
Tap the words in the right order.
Tap the words in the right order.
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Tell a friend about a change of plans in Japanese, then turn your sentence into a polite past statement.