📘 Meaning & Usage
～ちゃいけない and ～じゃいけない are casual spoken forms of ～てはいけない, which expresses a prohibition: “must not do.”
Translation: “You must not…”
Form:
Verb-て-form + ちゃいけない(for verbs ending in …+て)Verb-て-form + じゃいけない(after い-adj/な-adj/verbs ending in …+で)
💡 Example Sentences
- ここでタバコを吸っちゃいけない。
You must not smoke here. - 宿題を忘れちゃいけないよ。
You must not forget your homework. - 夜遅くまでゲームをしてじゃいけない。
You must not play games until late at night. - 先生の話を聞かなくちゃいけない。
You must listen to the teacher’s talk.
📝 Practice Exercises
1. Fill in the blanks
- 教室で走っ＿＿＿＿＿＿。
- 試験中にカンニングし＿＿＿＿＿＿。
- 人の物を勝手に使っ＿＿＿＿＿＿。
✔ Answers:
- ちゃいけない
- ちゃいけない
- ちゃいけない
2. Translate into Japanese
- You must not enter without permission.
- You must not eat in class.
- You must not speak loudly here.
✔ Sample Answers:
- 許可なしに入っちゃいけない。
- 教室で食べちゃいけない。
- ここで大声で話しちゃいけない。
📚 Vocabulary List
- タバコ (たばこ): cigarette
- 吸う (すう): to smoke
- 宿題 (しゅくだい): homework
- 忘れる (わすれる): to forget
- 夜遅く (よるおそく): late at night
- ゲーム: game
- 先生 (せんせい): teacher
- 話 (はなし): talk, story
- 聞く (きく): to listen
- 許可 (きょか): permission
- 入る (はいる): to enter
- 教室 (きょうしつ): classroom
- 食べる (たべる): to eat
- 大声 (おおごえ): loud voice
- 話す (はなす): to speak
📖 Kanji List
- 吸 (す) – inhale; to smoke
- 宿 (しゅく) – lodging;宿題 uses 宿 + 題
- 題 (だい) – topic; question
- 忘 (ぼう) – forget
- 遅 (ち) – late
- 許 (きょ) – permit
- 可 (か) – can, acceptable
- 教 (きょう) – teach;教室 uses 教 + 室
- 室 (しつ) – room
- 話 (わ) – talk, story
- 聞 (ぶん) – hear, listen
- 声 (せい) – voice
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I’m a software engineer based in Japan, with experience in developing web and mobile applications. I’m passionate about technology, especially in DevOps, AI, and app development using platforms like AWS, Flutter, and Node.js. My goal is to build a website that shares knowledge about the Japanese language and IT, helping everyone learn and grow more easily in the digital era.
