مَا كَاتِبٌ إِلَّا زَيْدٌ
No one is a writer except Zayd.
This is attribute-to-subject qasr. It is ifrād if the listener thinks both Zayd and ʿAmr write; qalb if the listener thinks ʿAmr writes instead of Zayd; taʿyīn if the listener is undecided between them.
If it is genuinely true of all members of the relevant complete domain, the restriction may count as real. One sentence can therefore be classified on several axes only after its context and scope are established.
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Qasr: Definitions, Real and Relative Restriction, and Ifrād, Qalb and Taʿyīn
مَا كَاتِبٌ إِلَّا زَيْدٌ
No one is a writer except Zayd.
This is attribute-to-subject qasr. It is ifrād if the listener thinks both Zayd and ʿAmr write; qalb if the listener thinks ʿAmr writes instead of Zayd; taʿyīn if the listener is undecided between them.
If it is genuinely true of all members of the relevant complete domain, the restriction may count as real. One sentence can therefore be classified on several axes only after its context and scope are established.