已经爬过文，但有些事情还是不太清楚，
想确定一下。
目前状况：
先生使用OPT（EAD卡今年5/1生效），现在在学校任职，学校最近开始帮忙办H1b，
但我之前已经买了明年一月回去台湾，二月返美的机票
写信问学校，得到的答复如下：
1. If she is going to travel in January and wants to return
as an F-2 prior to 5/1/17, DO NOT apply for the H-4 with the H-1B.
*Upon return, submit an I-539 for change of status to H4,
she is responsible for applying for her H-4.
She will have to indicate the request is based on
an H-1 application already on file and provide documentation.
Since she is requesting a change of status,
she will need to remain in the US until a decision is made on her application.
It is unlikely her application will be decided at that same time as yours,
and could take many months to be adjudicate.
上面这段是说，如果我要这时间回去，我就不要现在跟着一起申请H4，
但是爬文是说一旦H1b递件，先生的F1也跟着失效，所以我也无法用F2回来美国？
Safest option - Apply for the H-4 now with the H-1B.
*She does not leave in January, but waits to travel until H-1/H-4
have been approved.
Then apply for H4 visa stamp abroad and enter after 5/1/17.
又说
Once the H-4 application has been submitted and she leave the US,
she will not be able to return until after the H-4 is approved
sometime next April.
If she is out of the country, you can FedEx the approved H-4 to her
So that she can reenter the US at that time.
所以我也可以一月离境，但是一路待到5/1在返美？我猜5/1应该是H1b生效日，
那是否可以在生效日前10天入境，即4/21之后就可入境？
（会这样问是因为机票的三个月效期）
或者在机票不更动的状态下，拿到H1b的文件后（现在申请二月文件应该下来了吧?!)
去AIT申请H4，但使用ESTA返美，5月再去加拿大换回H4？（会被海关禁止入境吗？）