Obligation and Permission in Japanese
Understanding how to express obligation and permission is crucial when learning Japanese. These concepts allow you to navigate everyday situations, from asking for approval to understanding rules. In this blog, we’ll explore two essential structures: Verb te-form + もいい (“May”) and Verb te-form + はだめ (“Must not”).
1. Verb te-form + もいい: Expressing Permission (“May”)
The structure Verb te-form + もいい is used to ask for or give permission to do something. It translates to “May I…?” or “You may…” in English.
How It Works:
- Conjugate the verb into its te-form.
- Add もいい to grant or inquire about permission.
Examples:
- ここでたべてもいいですか？
(Koko de tabete mo ii desu ka?)
“May I eat here?” - はい、たべてもいいです。
(Hai, tabete mo ii desu.)
“Yes, you may eat.” - しゃしんをとってもいいです。
(Shashin o totte mo ii desu.)
“You may take a photo.”
Casual Form:
- ここにすわってもいい？
(Koko ni suwatte mo ii?)
“Can I sit here?”
2. Verb te-form + はだめ: Prohibiting Actions (“Must not”)
The structure Verb te-form + はだめ is used to express prohibition. It translates to “You must not…” in English.
How It Works:
- Conjugate the verb into its te-form.
- Add はだめ to indicate that an action is not allowed.
Examples:
- ここでたばこをすってはだめです。
(Koko de tabako o sutte wa dame desu.)
“You must not smoke here.” - さわってはだめです。
(Sawatte wa dame desu.)
“You must not touch.” - ここにゴミをすててはだめです。
(Koko ni gomi o sutete wa dame desu.)
“You must not throw trash here.”
Casual Form:
- ここでねてはだめ。
(Koko de nete wa dame.)
“You can’t sleep here.”
3. Combining Both Structures
These expressions often come in handy together when discussing what is allowed and what is prohibited. For example:
- このほんをよんでもいいですが、かえしてはだめです。
(Kono hon o yonde mo ii desu ga, kaeshite wa dame desu.)
“You may read this book, but you must not take it home.”
4. Cultural Notes
In Japan, these expressions are frequently used in formal and informal situations. Here are some important points to remember:
- When asking for permission, it’s polite to add ですか or いいですか to maintain politeness.
- はだめ is direct, so in formal situations, you might soften it with phrases like いけません (ikenai) for “not allowed.”
5. Practice Time
Try forming sentences using these structures:
- Ask if you can use your phone in class.
- Prohibit someone from running in the hallway.
- Give permission to drink coffee at your home.
Post your sentences in the comments, and I’ll correct them!
Mastering these grammar points will make you more confident in your Japanese conversations. Whether you’re asking for permission or ensuring you follow rules, these structures are indispensable for fluency.
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Happy learning! 😊
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Vikas Kumar is a multilingual educator, language specialist, and book author, and the founder of My Language Classes, an independent language learning platform dedicated to structured, clarity-driven language education.
With over eight years of professional experience working with languages, Vikas has taught and supported learners across English, Spanish, and Japanese, helping them build strong grammatical foundations, practical usage skills, and long-term accuracy. His work focuses on eliminating confusion in language learning by emphasizing structure, patterns, and real usage over rote memorization.
Vikas has worked as a Japanese language expert with multiple multinational organizations, supporting cross-border communication, translation, and language-driven operations in professional environments. Alongside his corporate experience, he has spent several years teaching Japanese and Spanish independently, designing lessons tailored to academic goals, professional needs, and exam preparation.
As an author, Vikas writes structured language learning books that focus on grammar mastery, clarity of usage, and exam-oriented accuracy. His published works include guides on English tenses, verb types, and prepositions, as well as Spanish learning resources aligned with DELE A1 preparation. His books are designed for self-learners, educators, and serious students who want depth, not shortcuts.
Through My Language Classes, he publishes comprehensive learning resources covering grammar, vocabulary, and language learning strategy across English, Spanish, and Japanese. The platform is built for learners at different stages, with a strong emphasis on logical progression, clear explanations, and practical application.
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