user: Question: Which class more recent than 1988 has G tyres?
Columns: ['Year', 'Class', 'Tyres', 'Team', 'Co-Drivers', 'Laps', 'Pos.', 'Class Pos.']
Types: ['real', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: [1982.0, 'C', 'D', 'Dome Co. Ltd.', 'Chris Craft', 85.0, 'DNF', 'DNF']
SQL:

assistant: SELECT "Class" FROM "Table" WHERE "Tyres" = 'G' AND "Year" > 1988.0;