Permission to do with 〜てもいい
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…?” Following a misunderstanding, Cocoa and her friends ended up at the tea house where Syaro works. When Syaro is invited to study at the library with the others, she considers Rize may praise her for helping the others.Further Reading
Examples
Asking to have tea with 〜てもいい

Asking to teach with 〜てもいい

Supplemental Examples