لَا يَدْخُلَانِ إِلَّا عَلَى الْجُمْلَةِ
Translation: The two only introduce clauses.
Alā and amā introduce clauses. Hā also occurs directly with demonstratives, a usage not available to the other two.
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The Source’s Governing Distinction
Attention Particles: Alā, Amā and Hā
لَا يَدْخُلَانِ إِلَّا عَلَى الْجُمْلَةِ
Translation: The two only introduce clauses.
Alā and amā introduce clauses. Hā also occurs directly with demonstratives, a usage not available to the other two.