Meaning
Used for prohibition or a strict rule.
Formation
- て form + はいけない — 走ってはいけない
- Colloquial contraction: ては → ちゃ, では → じゃ
When to use it
- Core use
- Must not, is not allowed
Examples
20 sentences-
ここで走ってはいけない
You must not run here.
-
試験のときは辞書を使ってはいけない
You must not use a dictionary during the exam.
-
この川で泳いではいけない
You must not swim in this river.
-
人のパンを勝手に食べてはいけない
You must not eat someone else’s bread without asking.
-
夜遅くコーヒーを飲んではいけない
You must not drink coffee late at night.
-
会議中にスマホを見てはいけない
You must not look at your phone during the meeting.
-
展示品に触ってはいけません
You must not touch the exhibits.
-
ここに車を止めてはいけません
You must not park a car here.
12 more examples
-
子どもだけで川に入ってはいけません
Children must not enter the river by themselves.
-
人の秘密を話してはいけません
You must not reveal another person's secrets.
-
ここでたばこを吸ってはいけません
You must not smoke here.
-
このボタンを押してはいけません
You must not press this button.
-
授業中に寝てはいけません
You must not sleep during class.
-
夜に大きな音を出してはいけません
You must not make loud noises at night.
-
美術館で写真を撮ってはいけません
You must not take photos in the art museum.
-
この水を飲んではいけません
You must not drink this water.
-
図書館で大きな声で話してはいけません
You must not talk loudly in the library.
-
パスワードを人に教えてはいけません
You must not tell other people your password.
-
大事な手紙を捨ててはいけません
You must not throw away important letters.
-
教室でご飯を食べてはいけません
You must not eat in the classroom.
Important notes
- This construction expresses a prohibition or rule.
Common mistakes
- Do not confuse 行ってはいけない (must not go) with 行かなくてもいい (need not go).
Check yourself
Pick the translation of each sentence. The wrong options translate similar patterns, so watch the grammar rather than the words.
Similar grammar
Hear it in podcasts
The pattern appears in these episodes. They open in the app with the transcript and translation.
The trainer requires a free account. Examples and practice questions on this page are available without signing up.