Ar-rajulu mubtasimun is a nominal sentence: the man is smiling. Mubtasimun is a nominative predicate, although it is also an active participle.
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A Participle as a Predicate
Choosing the Correct Parsing: Meaning, Governance and Context
Ar-rajulu mubtasimun is a nominal sentence: the man is smiling. Mubtasimun is a nominative predicate, although it is also an active participle.