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如果J1過期後，把身份轉成B2，在B2 approval 之前，H1b辦下來了，還能使用H1b嗎？
-That will be a problem. If H-1 is approved first and B-2 is approved later, then your H-1 status will be overridden by B-2 status. Thus, your status is B-2, not H-1. So, you have to go to China to get the H-1 visa to come back to work.

Vice versa, if B-2 is approved first,, and the H-1 is approved, later, then you can stay in US and work with H-1 status.

如果可以，B2 的申請怎麽辦呢？- If your employer cannot file H-1 petition before your J-1 expires, you may have no choice: either file B-2 application to stay in US (see above about the impact) or leave US and wait for the H-1 approval in China, then apply for the H-1 visa to come back.

這樣做對以後綠卡申請有影響嗎？
-No.

謝謝8老師，懇請再次回複。