لَيْسَ الْبَابُ مَفْتُوحًا
Translation: The door is not open.
لَيْسَ: defective, past-form, inflexible negative verb.
الْبَابُ: nominative ism laysa.
مَفْتُوحًا: accusative khabar laysa.
Negation does not reverse the grammatical case pattern: the predicate remains accusative.
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The Ism of Kāna and Its Sisters
لَيْسَ الْبَابُ مَفْتُوحًا
Translation: The door is not open.
لَيْسَ: defective, past-form, inflexible negative verb.
الْبَابُ: nominative ism laysa.
مَفْتُوحًا: accusative khabar laysa.
Negation does not reverse the grammatical case pattern: the predicate remains accusative.