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H1B失業，如果在GRACE PERIOD期間轉B2，B2 PENDING 時找到工作，

1. 是不是可以馬上轉回H1B？
-Yes, but the problem is that if the H-1 is approved first, the B-2 is approved later, then you need to go outside US to get the H-1 visa to come back. 
還是要WITHDRAW B2 後才能轉回H1B？
-No. Unless you file H-1 transfer during the grace period, you cannot withdraw the B-2 because there is status gap if you do it.

2. 如果B2 PENDING 期間找到工作，收到H1B petition 的 RECEIPT 就可以上班嗎？
-Yes. See the above answer to question 1.

還是要得到APPROVED才能上班？

3. 如果B2 APPROVED 後找到工作，如果B2 PENDING 期間找到工作，收到H1B petition 的 RECEIPT 就可以上班嗎？
-No.

還是要得到APPROVED才能上班？
-Yes.

謝謝8老師。