CREATE TABLE table_name_21 (silver VARCHAR2, year VARCHAR2, gold VARCHAR2)

Who won silver in the year before 2010, the year Chan Ming Shu won gold?
SELECT silver FROM table_name_21 WHERE year < 2010 AND gold = "chan ming shu"
SELECT "silver" FROM "table_name_21" WHERE "chan ming shu" = "gold" AND "year" < 2010