我有一个朋友和他太太，两年的AP 今年十月到期。期间他有几次短暂回美国办事。 请问：
1. 他应该什么时候回美国申请renew AP？
-Do you mean Reentry Permit (RP)? He can come back to file I-131 in advance up to 120 days before the current RP expires.
是ｒｅｎｅｗ 还是重新申请？
-It is renewal, but not different from filing a new application (samething).
2. 有没有相应网站提供所有需填写的表格？
-He needs to come back to US to file I-131 as he did before. See:
3. 再次申请ＡＰ会不会有被拒的可能或者影响现有的绿卡？有没有可以提醒的注意事项？
-USCIS may approve his renewal application for one time, but if he continues to apply for the renewal again and again, USCIS may not approve his later applications.
