않지만

In a sentence

• 나는 피곤하지 않았지만, 일찍 잠을 잤어요.

  I wasn't tired, but I went to bed early.

  The word '않지만' is used here to negate the verb '피곤하다' (to be tired) and combine it with '하지만' (but), expressing a contrast in the statement.

• 이 책은 재미는 없지만, 매우 유익해요.

  This book is not entertaining, but it is very useful.

  '않지만' is used to negate '재미있다' (to be entertaining), showing contrast with the adjective '유익하다' (to be useful).

• 그는 자주 오지 않지만, 올 때 항상 선물을 가져와요.

  He doesn't come often, but he always brings a gift when he does.

  Here, '않지만' negates the verb '오다' (to come) and shows a concession to the subsequent clause.