Table: mma_fight_results_18
Columns: res
record
opponent
method
event
round
time

Question: Which Opponent has a Time of 2:31?
SQL: SELECT "opponent" FROM mma_fight_results_18 WHERE "time" = '2:31'

Question: Which Method has a Round of 1, and a Time of 0:28?
SQL: SELECT "method" FROM mma_fight_results_18 WHERE "round" = 1 AND "time" = '0:28'

Question: Which Time has an Event of call to arms i?
SQL: SELECT "time" FROM mma_fight_results_18 WHERE "event" = 'call to arms i'