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Grammar Book

GrammarBook N5: ~てもいいです

  • 09 Jan, 2026
  • Com 0
N5-G-024

~てもいいです (Permission)

Supporting / Te-form

👀 Layer A: Visual Guide (直感理解)

📝 Quick Summary (まとめ)

「許可(きょか)」を求めたり、与(あた)えたりする表現です。「~しても大丈夫(だいじょうぶ)ですか?」と聞くときに使います。
Use this pattern to ask for permission (“May I…?”) or to give permission (“You may…”). It literally means “Even if I do [Action], is it good?”

Structure: [Verb Te-form] + も いいですか (mo ii desu ka).

🔗 Connected Grammar (関連文法):

  • N5-G-022: ~てください (Request)
  • N5-G-025: ~てはいけません (Prohibition)

🔍 Layer B: Deepening (深掘り)

💡 Raya’s Hack (攻略法)

「も (MO)」を忘れないで!
「食べていいですか?」でも通じるけど、正しい日本語は「食べてもいいですか?」だよ。
「MO」は「Even if(もし~しても)」という大事な接着剤(せっちゃくざい)なんだ。

Don’t forget the “MO”! It acts as the logic bridge meaning “Even if”. “Even if I do this, is it good?” -> “May I do this?”.

🚧 Joy’s Mistake (よくある間違い)

Scene: Joy asks to take a photo.

Joy: 「写真(しゃしん)を 撮る もいいですか?」
(Shashin o toru mo ii desu ka?)

❌ Wrong!

Why?

「撮る (Toru)」は辞書形(じしょけい)です。「も」の前は必ず「て形 (Te-form)」にします。
正解は「撮って もいいですか (Totte mo ii desu ka)」です。

You cannot use the Dictionary Form before “mo”. You must change the verb to Te-form first. Correct: “Totte mo ii desu ka?”.

🔥 Layer C: Practice Loop

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

Level 1: Asking for Permission

Q1. Taberu (Eat) → “May I eat?”
答え: Tabete mo ii desu ka? (食べてもいいですか)

(Te-form + mo ii desu ka)

Q2. Miru (Look) → “May I look?”
答え: Mite mo ii desu ka? (見てもいいですか)

(Te-form + mo ii desu ka)

Q3. Hairu (Enter) → “May I enter?”
答え: Haitte mo ii desu ka? (入ってもいいですか)

(U-verb: ru -> tte)

Q4. Shashin o toru (Take photo) → “May I take a photo?”
答え: Shashin o totte mo ii desu ka? (写真を撮ってもいいですか)

(U-verb: ru -> tte)

Q5. Tsukau (Use) → “May I use this?” (Kore o…)
答え: これを使ってもいいですか? (Kore o tsukatte mo ii desu ka?)

(U-verb: u -> tte)

Level 2: Advanced (Giving Permission)

Q6. Translate: “Yes, you may eat.”
答え: はい、食べてもいいです。

(Hai, tabete mo ii desu.)

Q7. Translate: “May I sit here?” (Koko ni suwaru)
答え: ここに 座(すわ)ってもいいですか?

(Koko ni suwatte mo ii desu ka?)

Q8. Translate: “May I go to the toilet?”
答え: トイレに 行(い)ってもいいですか?

(Toire ni itte mo ii desu ka?)

Q9. Translate: “May I smoke?” (Tabako o suu)
答え: タバコを 吸(す)ってもいいですか?

(Tabako o sutte mo ii desu ka?)

Q10. Translate: “Can I open the window?” (Mado o akeru)
答え: 窓(まど)を 開(あ)けてもいいですか?

(Mado o akete mo ii desu ka?)

Related posts:

GrammarBook N5 : AはBです (A is B) GrammarBook N5: The Particle は (topic marker) GrammarBook N5: The Particle も (also) GrammarBook N5: い-adjectives
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GrammarBook N5: ~ています (Progressive State / Action)
GrammarBook N5: ~てはいけません

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