我老公现在在A 公司，然后马上要转去B公司，在transfer期间一直继续在A公司上班直到拿到B公司的i797A。那么是不是一旦拿到B公司的i797A 就需要马上离职A公司？
-Not have to, but he can if he wants and B company agree.
并且B公司的I797A上的开始日期必须是老公去B公司开始上班的日期呢？
-It does not matter. He does not have to go to work for B Company even if the H-1B transfer is approved, up to him and B Company.
（因为不是很清楚如果B 公司的I797A下来，就说明A公司的797A马上失效？）
-No. Only he leaves A Company or the H-1B I-94 (from A company) expires, the H-1B approval of A company can be invalid.
-Not have to, but he can if he wants and B company agree.
并且B公司的I797A上的开始日期必须是老公去B公司开始上班的日期呢？
-It does not matter. He does not have to go to work for B Company even if the H-1B transfer is approved, up to him and B Company.
（因为不是很清楚如果B 公司的I797A下来，就说明A公司的797A马上失效？）
-No. Only he leaves A Company or the H-1B I-94 (from A company) expires, the H-1B approval of A company can be invalid.
