Asking & Giving Permission: 〜てもいい (May I? / It is fine to...)

Mental Model: The Concessive Doorway

How do you politely ask for permission or grant approval in Japanese? The foundational formula is: [Verb in て-form] + も + いい (です)

Linguistically, this structure is a marvel of social consideration: • 〜て: The action is framed in its connective state. • も: The inclusive particle meaning “even” or “also”. • いい: The adjective meaning “good”, “fine”, or “permissible”.

Literally, you are saying: “Even if [action] is performed, it is good.”

When framed as an inquiry with question particle か (〜てもいいですか), it translates naturally to “May I do this?” or “Is it okay if I do this?”. Because it avoids demanding an imperative approval, it softens your inquiry into a considerate check on the other person’s comfort.

Giving and Receiving Permission: Register Spectrum

Depending on your relationship with the listener, you can adjust the formality:

• Casual / Among Close Friends:
• Question: ここで写真を撮ってもいい？ (”Can I take a photo here?”)
• Answer: うん、撮ってもいいよ。 / いいよ！ (”Yeah, go ahead!”)

• Standard Polite / Daily Adult Japanese:
• Question: ここで写真を撮ってもいいですか。 (”May I take a photo here?”)
• Answer: はい、いいですよ。 / どうぞ。 (”Yes, that is fine / Please do.”)

• Formal / Business & Respectful:
• Question: こちらの資料を拝見してもよろしいでしょうか。 (Humble/Honorific inquiry)
• Answer: はい、使っていただいて構いません。 (”Yes, there is no issue at all.”) In business settings, 〜ても構いません (temo kamaimasen — ”it causes no hindrance”) or 〜てもよろしいです is preferred over simple いいです.

The Flip Side: “You Don't Have To” (〜なくてもいい)

What if you want to say that something is optional? Take the verb’s plain negative (ない), turn it into its negative connective form (なくて), and add もいい:

[Verb in negative なくて-form] + もいいです • 明日、早く来なくてもいいです。 (”Tomorrow, you don't have to come early.” — literally: “Even if you do not come early, it is fine.”) • 全部食べなくてもいいですよ。 (”You don't have to eat everything.”)

Critical Traps to Avoid

• Trap 1: Asking with たいですか: Never ask someone permission by asking *写真を撮りたいですか. Asking someone if they want to do something sounds probing and inappropriate when asking for permission. Always use 〜てもいいですか.

• Trap 2: Declining Too Bluntly: If someone asks 〜てもいいですか, never bark back *いいえ、だめです! That sounds shockingly aggressive. Soften refusals with polite hesitation: すみません、ここはちょっと… (”I am sorry, but here is a bit... [not allowed]”).