Database: student_1
Question: Which students in third grade are not taught by teacher COVIN JEROME? Give me the last names of the students.
SQL:
SELECT DISTINCT T1.lastname FROM list AS T1 JOIN teachers AS T2 ON T1.classroom  =  T2.classroom WHERE T1.grade  =  3 AND T2.firstname != "COVIN" AND T2.lastname != "JEROME"