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 8 老师，

1. 现在开始有两个排期，看那个排期可以提前交 I－485？

-If your PD is earlier than  the DATE FOR FILING OF EMPLOYMENT-BASED VISA APPLICATIONS, you can file I-485 if you are physically present in US (though your PD is not current), but the I-485 will not be approved until the PD is current ((i.e.  until your PD is earlier than APPLICATION FINAL ACTION DATE). 

我现在是F2, PD 是 2014.6

2. 如果可以提前递交 I-485, 什么时候来美比较合适？

-Up to you.

3. 以 F2来美，再申请工卡，找工作。I－485会被据吗？

-No, but the problem is that you might not get the F-2 visa to enter US due to immigration intent. So, you may try to enter US as soon as possible.

谢谢指点