The ~てもいい structure is used to express permission or indicate that it is okay to do something. It is often used to ask for or grant permission in polite and casual contexts.
Requesting permission/approval: To ask for permission, use ~てもいいですか.
To softly refuse, you can say:
Giving permission: Used to state that the speaker allows or approves of an action.
In casual contexts, も can be dropped, giving the phrase a more direct feel.
~てもだいじょうぶ大丈夫 is often used to give reassurance or permission. It sounds slightly softer and more conversational than ~てもいい.
Structure: V[て] + も + だいじょうぶ大丈夫