The same ism-mansub and khabar-marfu relationship appears with كَأَنَّ and لَكِنَّ.
كَأَنَّ زَيْدًا مَرِيضٌ
زَيْدًا is the mansub ism; مَرِيضٌ is the marfu khabar.
لَكِنَّ الْكَافِرِينَ جَاهِلُونَ
الْكَافِرِينَ is the mansub ism; جَاهِلُونَ is the marfu khabar. Notice that this mansub ism does not end in fathah.
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Introduction to Mansubat and the Ism of Inna
The same ism-mansub and khabar-marfu relationship appears with كَأَنَّ and لَكِنَّ.
كَأَنَّ زَيْدًا مَرِيضٌ
زَيْدًا is the mansub ism; مَرِيضٌ is the marfu khabar.
لَكِنَّ الْكَافِرِينَ جَاهِلُونَ
الْكَافِرِينَ is the mansub ism; جَاهِلُونَ is the marfu khabar. Notice that this mansub ism does not end in fathah.