جَاءَ رَجُلٌ سَكْرَانُ — An intoxicated man came.
جَاءَ is a past verb; رَجُلٌ is the nominative subject; سَكْرَانُ is a nominative adjective (naʿt) marked by ḍamma.
Rajul has tanwīn because it is fully declinable; sakrān does not, although both are nominative.
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Diptote Causes — Additional Alif and Nūn and Their Conditions
جَاءَ رَجُلٌ سَكْرَانُ — An intoxicated man came.
جَاءَ is a past verb; رَجُلٌ is the nominative subject; سَكْرَانُ is a nominative adjective (naʿt) marked by ḍamma.
Rajul has tanwīn because it is fully declinable; sakrān does not, although both are nominative.