Meaning
Gives permission or, in question form, asks for permission to act.
Formation
- Put the verb in the te-form and add もいいです.
- Add か for a question: 〜てもいいですか.
When to use it
- Permission
- The speaker says that an action is allowed.
- Requesting permission
- With か or rising intonation, asks whether the action is allowed.
Example
このパソコンを使ってもいいですか
May I use this computer?
Important notes
- いい applies to the whole pattern and means acceptability here, not simply the adjective 'good'.
Common mistakes
- Do not confuse it with 〜てはいけない, which prohibits the action.