Table: tunis_grand_prix_1931
Columns: name
circuit
date
winning_driver
winning_constructor
report

Question: Tell me the date for rudolf caracciola for avusrennen
SQL: SELECT "date" FROM tunis_grand_prix_1931 WHERE "winning_driver" = 'rudolf caracciola' AND "name" = 'avusrennen'

Question: Tell me the circuit for 10 may for targa florio
SQL: SELECT "circuit" FROM tunis_grand_prix_1931 WHERE "date" = '10 may' AND "name" = 'targa florio'