CREATE TABLE "classification" (
  "driver" text,
  "constructor" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);

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 "classification" 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 "classification" 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 "classification" WHERE "laps"<4;