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Grammar Book

GrammarBook N5: ~てはいけません

  • 09 Jan, 2026
  • Com 0

N5-G-025

~てはいけません (Prohibition)

Supporting / Te-form

👀 Layer A: Visual Guide (直感理解)

📝 Quick Summary (まとめ)

「禁止(きんし)」を表す強い表現です。「~してはいけない」「~してはだめだ」とルールを伝えるときに使います。
Use this pattern to express a prohibition or a rule (“You must not…”). It is stronger than a simple request.

Structure: [Verb Te-form] + は いけません (wa ikemasen).

🔗 Connected Grammar (関連文法):

  • N5-G-024: ~てもいいです (Permission)
  • N5-G-022: ~てください (Request)

🔍 Layer B: Deepening (深掘り)

💡 Raya’s Hack (攻略法)

「は (WA)」を忘れないで!
「食べてはいけません」の「は」は、アクション(食べること)をトピックにして、「それはダメ!」と言っているんだ。
「食べていけません」だと音がつながって弱く聞こえるよ。「は」でしっかり区切ろう!

Don’t forget the “WA”! It highlights the action as the topic (“As for eating…”) and then slams the door with “Ikemasen” (“It is a no-go!”).

🚧 Joy’s Mistake (よくある間違い)

Scene: Joy yells at someone not to run.

Joy: 「走る はいけません!」
(Hashiru wa ikemasen!)

❌ Wrong!

Why?

「走る (Hashiru)」は辞書形です。「は」の前は必ず「て形 (Te-form)」にします。
正解は「走って はいけません (Hashitte wa ikemasen)」です。

You cannot use the Dictionary Form before “wa”. You must change the verb to Te-form first. Correct: “Hashitte wa ikemasen”.

🔥 Layer C: Practice Loop

Now it’s time to test your learning through the next 10 practice drills!

Level 1: Basic Prohibition

Q1. Taberu (Eat) → “You must not eat.”

答え: Tabete wa ikemasen (食べてはいけません)

(Te-form + wa ikemasen)

Q2. Miru (Look) → “You must not look.”

答え: Mite wa ikemasen (見てはいけません)

(Te-form + wa ikemasen)

Q3. Hairu (Enter) → “Do not enter.”

答え: Haitte wa ikemasen (入ってはいけません)

(U-verb: ru -> tte)

Q4. Shashin o toru (Take photo) → “No photos.”

答え: Shashin o totte wa ikemasen (写真を撮ってはいけません)

(U-verb: ru -> tte)

Q5. Tsukau (Use) → “You must not use.”

答え: Tsukatte wa ikemasen (使ってはいけません)

(U-verb: u -> tte)

Level 2: Advanced (Rules & Manners)

Q6. Translate: “You must not smoke here.” (Tabako o suu)

答え: ここで タバコを 吸(す)っては いけません。

(Koko de tabako o sutte wa ikemasen.)

Q7. Translate: “You must not run in the library.” (Hashiru)

答え: 図書館(としょかん)で 走(はし)っては いけません。

(Toshokan de hashitte wa ikemasen.)

Q8. Translate: “You must not forget homework.” (Wasureru)

答え: 宿題(しゅくだい)を 忘(わす)れては いけません。

(Shukudai o wasurete wa ikemasen.)

Q9. Translate: “You must not drink alcohol.” (Osake o nomu)

答え: お酒(さけ)を 飲(の)んでは いけません。

(Osake o nonde wa ikemasen. *mu -> nde*)

Q10. Translate: “You must not speak English.” (Eigo o hanasu)

答え: 英語(えいご)を 話(はな)しては いけません。

(Eigo o hanashite wa ikemasen.)

Related posts:

GrammarBook N5: The Particle が (identifier/existence marker) GrammarBook N5: ~ます / ~ません GrammarBook N5: ~てください (The Polite Request) GrammarBook N5: ~に行きます / 来ます (Go to do…)
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