كُلُّ شَيْءٍ هَالِكٌ إِلَّا وَجْهَهُ
Everything will perish except His Countenance. وَجْهَهُ is mansub as mustathna.
فَسَجَدُوا إِلَّا إِبْلِيْسَ
They prostrated except Iblis. إِبْلِيْسَ is mansub.
لِكُلِّ دَاءٍ دَوَاءٌ إِلَّا الْمَوْتَ
Every illness has a remedy except death. الْمَوْتَ is mansub.
In each sentence the group is present and the statement is affirmative.