اِشْتَرَيْتُ عِشْرِينَ قَلَمًا: verb with attached subject; ʿishrīna is accusative direct object with yāʾ, and qalaman accusative number tamyīz.
امْتَلَأَ الْإِنَاءُ مَاءً: past verb, nominative subject, and accusative relation tamyīz (“filled with what?”).
These are additional teaching examples, not quoted from the printed book.