question: What week did the member who's original tribe was shark and who was sent to the third island on week 14 arrive on the main island?
answer: SELECT week_arrived_on_main_island FROM table_11764007_2 WHERE original_tribe = "Shark" AND week_sent_to_third_island = "14"
context: CREATE TABLE table_11764007_2 (week_arrived_on_main_island VARCHAR, original_tribe VARCHAR, week_sent_to_third_island VARCHAR)