听说现在转身份（I-539)需保持身份（valid I94）直到新身份批准。孩子去年七月申请 F2转 F1，现在已超过21周岁，I-539 仍 pending， 该怎么办？
https://www.uscis.gov/working-united-states/students-and-exchange-visitors/students-and-employment/changing-nonimmigrant-f-or-m-student-status