似乎是应该使用: USCIS网站:"Please note: If your current nonimmigrant status is B1, B2, F1, F2, J1, J2, M1, or M2, you should file Form I-539 using our new USCIS Electronic Immigration System, USCIS ELIS. USCIS ELIS provides enhanced customer service and faster processing times." 如果父母一起申请延期的话,需要结婚证证明两人关系。大部分人都不会把结婚证带来 的吧。。。该怎么办呢?