user: Question: What's the language of the school that teaches grades 4-12?
Columns: ['School', 'Year Founded', 'Denomination', 'Language', 'Grades', 'Gender', 'Private/Public']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Diocesan School for Girls (D.S.G)', '1874', 'Anglican', 'English', '4-12', 'Single sex female', 'Private']
SQL:

assistant: SELECT "Language" FROM "Table" WHERE "Grades" = '4-12';