شَمَّرَ الرَّجُلُ. — The man made an effort.
جَاءَ شَمَّرُ. — A person named Shammar came.
In the first, shammara is a verb. In the second, Shammar is a proper-name subject. The second is a teaching example assuming the form has been adopted as a name.
Shammar is nominative but has no tanwīn.
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Diptote Causes — Verb Patterns and Their Conditions
شَمَّرَ الرَّجُلُ. — The man made an effort.
جَاءَ شَمَّرُ. — A person named Shammar came.
In the first, shammara is a verb. In the second, Shammar is a proper-name subject. The second is a teaching example assuming the form has been adopted as a name.
Shammar is nominative but has no tanwīn.