كُنْتُ مَرِيضًا
Translation: I was ill.
كُنْ: past incomplete verb built on sukūn because of attached subject pronoun.
تُ: attached pronoun in nominative syntactic position as ism kāna.
مَرِيضًا: accusative khabar kāna.
The ism need not be an overt name such as Zayd; it may be a connected pronoun.