نَحْوُ: «مَا زَيْدٌ قَائِمًا، وَلَا رَجُلٌ أَفْضَلَ مِنْكَ».
Translation: For example: Zayd is not standing; and no man is better than you.
In the first example mā, and in the second lā, work like laysa: their ism is nominative and their khabar accusative.