Mā ajmala al-samāʾa has the same parsing: mā mubtadaʾ, ajmala an exclamatory verb with an implicit subject, and al-samāʾa its object.
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A Second Worked Example
The Two Exclamatory Verbs: Forms, Rules and Parsing
Mā ajmala al-samāʾa has the same parsing: mā mubtadaʾ, ajmala an exclamatory verb with an implicit subject, and al-samāʾa its object.