〜てもいい～te mo ii
"may / it's OK to (do)" — giving or asking permission.
What it means
Attach もいい(です) to a verb's て-form to say an action is allowed — "you may do X / it's OK to do X." Literally it's "even if you do X, it's fine." To ask permission, add か: 〜てもいいですか ("may I…?"). To refuse it, you switch to 〜てはいけない / だめ ("you must not").
How to make it
may / it's OK
may I…?
don't have to
may not
Examples — real lines from the library
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Related N5 grammar: 〜てください · 〜が好き · 〜ましょう