Permission to do with

Grammar: Permission » 〜てもいい

Add もいい to a verb’s て-form to ask or grant permission: “may I?” or “it is okay to”.

Usage Notes

〜てもいい asks for permission or says that an action is acceptable. In questions, it means “may I?” or “is it okay if…?”

Further Reading

Examples

Asking to have tea with 〜てもいい

Manga panel from ご注文はうさぎですか? showing example of Asking to have tea with 〜てもいい.
ご注文はうさぎですか? » Volume 1 » Page 63

Following a misunderstanding, Cocoa and her friends ended up at the tea house where Syaro works.

ココア:
「せっかくだからお茶(ちゃ)してってもいいかな?」
“Since we have the chance, would it be okay if we had some tea ?”
シャロ:
「しょうがないわねー」
“I guess it can't be helped.”

Asking to teach with 〜てもいい

Manga panel from ご注文はうさぎですか? showing example of Asking to teach with 〜てもいい.
ご注文はうさぎですか? » Volume 1 » Page 85

When Syaro is invited to study at the library with the others, she considers Rize may praise her for helping the others.

シャロ:
「そ そんなに言(い)うなら教(おし)えてあげてもいいかなー」
“I-if you insist that much, maybe I could teach you if that's okay.”
ココア:
「そこまでは言(い)ってないよ!」
“I didn't say all that!”

Supplemental Examples

Try finding this grammar in the following examples: