Table: mx_gp_1986
Columns: driver
constructor
laps
time_retired
grid

Question: who is the constructor when the laps is less than 68, the grid is more than 20 and the driver is thierry boutsen?
SQL: SELECT "constructor" FROM mx_gp_1986 WHERE "laps" < 68 AND "grid" > 20 AND "driver" = 'thierry boutsen'

Question: what is the laps when the time/retired is turbo and the grid is less than 14?
SQL: SELECT "laps" FROM mx_gp_1986 WHERE "time_retired" = 'turbo' AND "grid" < 14

Question: what is the time/retired when the laps is less than 4?
SQL: SELECT "time_retired" FROM mx_gp_1986 WHERE "laps" < 4