Table: f1_1958_season
Columns: entrant
constructor
chassis
engine
driver
rounds

Question: What was the constructor for jo bonnier of 6 rounds?
SQL: SELECT "constructor" FROM f1_1958_season WHERE "entrant" = 'jo bonnier' AND "rounds" = '6'

Question: What was the driver with chassis of t45 t44 and rounds of 7?
SQL: SELECT "driver" FROM f1_1958_season WHERE "chassis" = 't45 t44' AND "rounds" = '7'