Table: f1_1991_season
Columns: entrant
constructor
chassis
engine
tyre
driver
rounds

Question: Which chassis did Aguri Suzuki drive with an entrant of Larrousse F1?
SQL: SELECT "chassis" FROM f1_1991_season WHERE "entrant" = 'larrousse f1' AND "driver" = 'aguri suzuki'

Question: What was the entrant in round 16 were Ferrari was the constructor?
SQL: SELECT "entrant" FROM f1_1991_season WHERE "rounds" = '16' AND "constructor" = 'ferrari'