IRS 说J1的前三年或者F的前五年不应该算在substantial test里,但又说如果五年被exempt, 那么就要算,原文如下:You will not be an exempt individual as a student if you have been exempt as a teacher, trainee, student, Exchange Visitor, or Cultural Exchange Visitor on an "F, " "J, " "M, " or "Q " visa for any part of more than 5 calendar years, unless you establish to the satisfaction of the IRS that you do not intend to reside permanently in the United States