CREATE TABLE table_40488 ("Tournament" TEXT, "2004" TEXT, "2005" TEXT, "2006" TEXT, "2007" TEXT)

What is the 2007 that has a grand slam tournaments in 2006.
SELECT "2007" FROM table_40488 WHERE "2006" = 'grand slam tournaments'
SELECT "2007" FROM "table_40488" WHERE "2006" = 'grand slam tournaments'