Muwāfaqah is semantic correspondence between different verb forms in a specific usage. It does not make all uses of the forms interchangeable.
دَجَا اللَّيْلُ وَأَدْجَى
Translation: The night became dark.
The basic form and Form IV overlap here.
أَكْفَرَهُ وَكَفَّرَهُ
Translation: He attributed unbelief to him.
Form IV and Form II overlap in this use. The textbook's footnote also notes a related ṣayrūrah interpretation; context may support more than one semantic analysis.
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Property 14: Correspondence with Basic Form and Form II
Fifteen Semantic Properties of Form IV (Ifʿāl): From Causation to Responsiveness
Muwāfaqah is semantic correspondence between different verb forms in a specific usage. It does not make all uses of the forms interchangeable.
دَجَا اللَّيْلُ وَأَدْجَى
Translation: The night became dark.
The basic form and Form IV overlap here.
أَكْفَرَهُ وَكَفَّرَهُ
Translation: He attributed unbelief to him.
Form IV and Form II overlap in this use. The textbook's footnote also notes a related ṣayrūrah interpretation; context may support more than one semantic analysis.