SELECT DISTINCT T2.firstname FROM list AS T1 JOIN teachers AS T2 ON T1.classroom  =  T2.classroom WHERE grade  =  1
Find the first names of the teachers that teach first grade.
SELECT DISTINCT T2.firstname FROM list AS T1 JOIN teachers AS T2 ON T1.classroom = T2.classroom WHERE grade = 1
select distinct t2 . firstname from list as t1 join teachers as t2 on t1 . classroom = t2 . classroom where grade = value
Find the first names of the teachers that teach first grade .