回複：B2 visa extension questions. Please help

1. what supporting documents I need to send to them?
- Copy of passport, original I-94, and a cover letter

2. Do I have to send the oringinal I-94? is a photocopy good enough?
- Original requested per I-539 instruction

3. Can my parents go back to China before their oringinal I-94 expire? (if the process of the extension taking too long, I may have them return to China before get the USCIS decision)
- Yes


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