For your reference 回复：多谢。再问

For your reference:

I transfered from B1 to F1. My parents came to visit me after I became F1 shortly. I got H1B without problem. I-140 was approved & now I-485 pending. So far, so good.

But I transfered to F1 after entering US via B1 half year.

Hope this help. Good Luck!