CREATE TABLE table_12070 ("Year" FLOAT, "Movie title" TEXT, "Role" TEXT, "Direction" TEXT, "Screenplay" TEXT)

Which role did joemon play before 1991?
SELECT "Role" FROM table_12070 WHERE "Year" < '1991' AND "Direction" = 'joemon'
SELECT "Role" FROM "table_12070" WHERE "Direction" = 'joemon' AND "Year" < '1991'