Table: italian_grand_prix_1958
Columns: driver
constructor
laps
time_retired
grid

Question: Who was the Constructor when the Grid was 2?
SQL: SELECT "constructor" FROM italian_grand_prix_1958 WHERE "grid" = 2

Question: What is the time/retired of Driver Masten Gregory Carroll Shelby when the constructor was Maserati, the Grid was larger than 10 and there were more than 2 laps?
SQL: SELECT "time_retired" FROM italian_grand_prix_1958 WHERE "grid" > 10 AND "laps" > 2 AND "constructor" = 'maserati' AND "driver" = 'masten gregory carroll shelby'

Question: What was the average grid at the time Vanwall was constructor and there were 17 laps?
SQL: SELECT AVG("grid") FROM italian_grand_prix_1958 WHERE "constructor" = 'vanwall' AND "laps" = 17