user: Question: What is the grid for Johnny Herbert?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['David Coulthard', 'McLaren - Mercedes', 62.0, '1:34:25.4', 1.0]
SQL:

assistant: SELECT "Grid" FROM "Table" WHERE "Driver" = 'Johnny Herbert';