CREATE TABLE table_27298240_26 (aorist VARCHAR, imperfect VARCHAR)

Which aorist has imperfect form of bijasmo / bejasmo / besmo?
SELECT aorist FROM table_27298240_26 WHERE imperfect = "bijasmo / bejasmo / besmo"
SELECT "aorist" FROM "table_27298240_26" WHERE "bijasmo / bejasmo / besmo" = "imperfect"