أَصْبَحَ الطَّقْسُ بَارِدًا
Translation: The weather became cold / was cold in the morning.
أَصْبَحَ: past incomplete verb.
الطَّقْسُ: nominative ism aṣbaḥa.
بَارِدًا: accusative khabar aṣbaḥa.
Context determines whether the emphasis is on morning time or on becoming. The case pattern remains unchanged.