Four classical textbook contexts favor hamza rather than hal in the same construction: a fronted object, rhetorical reproach, connected am, and a preceding interrogative hamza before a conjunction.
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Four Special Contexts for Hamza
The Two Interrogative Particles: Hamza and Hal
Four classical textbook contexts favor hamza rather than hal in the same construction: a fronted object, rhetorical reproach, connected am, and a preceding interrogative hamza before a conjunction.