～てもいい (Asking or Giving Permission in Japanese)

Want to ask, “Can I go?” or say, “It’s okay to eat here”?

It's time for ～てもいい, the Japanese grammar for saying “It’s okay if…” or “You’re allowed to…” in Japanese.

From asking to use the bathroom to giving someone permission to take your photo (yes, photos without permission is considered rude/invasion of privacy in Japan), this grammar shows up everywhere in real life.

In this guide, you’ll learn:

• What ～てもいい means and when to use it
• How to form it with any verb
• The difference between asking and allowing
• Real-life examples
• Practice to make it stick

Let’s dive in!

What Does ～てもいい Mean?

「～てもいい」literally means “even if you do ___, it’s okay.”

But in practice, it’s used to:

• Ask for permission (Can I ___?)
• Say something is allowed (You may ___)
• Give someone the okay to do something

Think of it like:

• “Is it okay if I do ___?”
• “You’re allowed to ___.”
• “It’s fine to ___.”

Examples

• すわってもいいですか？ → May I sit down?
• トイレにいってもいいですか？ → Can I go to the bathroom?
• ここでしゃしんをとってもいいです よ。 → It’s okay to take photos here.
• はい、みてもいいです。 → Yes, you may watch.

You’ll hear it all the time in schools, offices, shops, and polite everyday conversations. It's nice to ask for permission, right?

How to Make the ～てもいい Form

We can break it down into just two parts:

Step 1: Change the verb into the ～て form

(たべる → たべて, のむ → のんで, etc.)

Step 2: Add 「もいい」

So:

• たべて + もいい → たべてもいい
• のんで + もいい → のんでもいい
• して + もいい → してもいい
• きて + もいい → きてもいい

Want to sound extra polite? Add 「ですか」 for questions or 「ですよ」 for confirmation.

What Does 「も」 Mean Here?

No, it's not a cow's mooing... モ〜 🐮 or the angry person who goes もー！😡

「も」 usually means “also” or “even,” but in this case, it softens the tone.

So ～てもいい = “Even if you do it, it’s okay.”

It makes the sentence more neutral and natural.

Real-Life Examples Using ～てもいい

ここにすわってもいいですか？

Koko ni suwatte mo ii desu ka? → May I sit here?

しゃしんをとってもいいですよ。

Shashin wo totte mo ii desu yo. → You’re allowed to take pictures.

このペンをつかってもいい？

Kono pen wo tsukatte mo ii? → Can I use this pen? (Casual)

きょうはやすんでもいいです。

Kyou wa yasunde mo ii desu. → It’s okay to take today off.

たべてもいい？

Tabete mo ii? → Can I eat this? 😋

Practice Time!

Practice 1: Turn into ～てもいい

Change these into permission questions using ～て もいいですか：

のみます → __________

はいります → __________

つかいます → __________

みます → __________

します → __________

Answers:

のんでもいいですか？

はいってもいいですか？

つかってもいいですか？

みてもいいですか？

してもいいですか？

Practice 2: Translate It!

Write in Japanese using ～てもいい:

• Can I open the window?
• May I go home already?
• You can eat that.

Answers:

• まどをあけてもいいですか？
• もううちにかえってもいいですか？
• それをたべてもいいです よ。

What About “You Can’t”?

To say “You’re not allowed to ___,” just change the ending to:

～てはいけません → You must not do

(We’ll cover this fully in a separate guide!)

Example:

• ここでタバコをすってはいけません。→ No smoking here.
• しゃしんをとってはいけません。-> You're not allowed to take photos. (Common in some Buddhist temples)

Or frankly, if you're okay being impolite, a quick ダメ！will do the trick.

• Kid 1: たべてもいい？ -> Can I eat it?
• Kid 2: だめ！ぼく の！ -> No! It's mine!

Final Recap

～てもいい is how you say “Can I?” or “It’s okay if you do” in Japanese.

• Use ～て form + もいい
• Add です or ですか for polite speech
• Great for asking permission or giving it politely