此人情况是OPT身份，但没有找到工作。现在OPT到期，需要维持身份的话得转回F1。F1身份研究生需要每学期注册9学分。因为没有经济资助，如果写博士论文可以计成学分就不需要注册课了。
想了解以下问题：
1。写博士论文期间是否可以不用注册课？记得有学校让用999作为课程代号。
-You need to talk to your school Internationbal Student Office. Because you said you are in OPT/OPT expiration, I don't know whether you have completed your study or not (it is confusing).
2。如果现在有公司愿意sponsor, 是否申请OPT延期？
-If you did not find a job within 3 months after you got OPT, Techincally you had been out of status. and thus, you can not come back to F-1 unless you leave US and reenter US using F-1 visa. So, discuss with your International Student Office wehther they have put your information to SEVIS to terminate your F-1 status.
3。OPT到期后好像有60天grace period. 在这60天当中, 假如找到公司sponsor, 可以申请OPT延期吗？
-No.
4。Grace period期间还可以调整成F1身份吗？
-Yes. Talk to your International Student Office.
恳请8老师或其他高人指点。非常感谢！新年快乐！
