Table: monaco_1968_race
Columns: driver
constructor
laps
time_retired
grid

Question: What company was Constructor when there were 16 laps and grid was 9?
SQL: SELECT "constructor" FROM monaco_1968_race WHERE "laps" = 16 AND "grid" = 9

Question: What is the Time/Retired when lotus - ford was constructor and the laps were less than 17?
SQL: SELECT "time_retired" FROM monaco_1968_race WHERE "constructor" = 'lotus - ford' AND "laps" < 17

Question: What is the number of the grid when there was a Time/Retired of engine and less than 9 laps?
SQL: SELECT SUM("grid") FROM monaco_1968_race WHERE "time_retired" = 'engine' AND "laps" < 9