user: Question: When rider John Hopkins had 21 laps, what was the grid?
Columns: ['Rider', 'Manufacturer', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Valentino Rossi', 'Yamaha', '21', '43:07.829', '1']
SQL:

assistant: SELECT "Grid" FROM "Table" WHERE "Laps" = '21' AND "Rider" = 'John Hopkins';