H１－B REF,Please help grace_ugly2008-06-13 13:21:29

My friend got H1-B REF letter from USCIS.USCIS want her to provide evidence of leaving USA after her TN expiration
她的情况是这样：
（１）２００７年１１月得到EAD(作为副申请人)。
（２）２００８年３月30日TN VISA 到期。
（３）２００８年４月１日递交H１－B申请

Questions:
(1)Did she have to leave USA after her TN expiration.
(2)How to write a letter to reply this REF letter.
(3)Is there any similar letter you can provide me?
(4)Could you provide some links about USCIS policy?

Thanks in advance

Xiaobaitu,Pijing and other experts ,Please give me help

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