وَلَا يَجُوزُ ذَلِكَ فِيمَا أَوَّلُهُ «مَا»، فَلَا يُقَالُ: «قَائِمًا مَا زَالَ زَيْدٌ».
Translation: With verbs beginning with mā, this fronting of the khabar before the whole mā + verb unit is not permitted under the book’s rule; thus “Qāʾiman mā zāla Zaydun” is not a permitted standard pattern.
The book gives this as a prohibited order, not as a model sentence to memorize.