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I hold both F1 and B1/B2 visa. My F1 visa would be active on 3 Aug 2013 while my B1/B2 visa is always active. Suppose I come to USA on 15 July under B1/B2 visa, could I take a flight to Canada on 10 Aug (or possibly 20 Aug) and come back to USA on the same date and return as a F1 student?

I have both a F1 and B1 visa. But my F1 visa only allow me to enter in Aug, 3, 2013, while my B1 visa is valid till next year. I want to enter US earlier to visit my girlfriend on 15 July,2013. could I use B1 to enter and then change to F1 as if i enter US using an F1 visa? Otherwise, do i have...