زَيْدٌ — definite as a proper name.
الْمُعَلِّمُ — definite because of al-.
رَجُلٌ — indefinite in this form.
طَالِبٌ — indefinite in this form.
The working mā accepts either type; working lā resembling laysa is restricted to an indefinite ism.
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Definite versus Indefinite
Ism of Mā and Lā Resembling Laysa; Khabar of Lā of Generic Negation
زَيْدٌ — definite as a proper name.
الْمُعَلِّمُ — definite because of al-.
رَجُلٌ — indefinite in this form.
طَالِبٌ — indefinite in this form.
The working mā accepts either type; working lā resembling laysa is restricted to an indefinite ism.