就是说只要“转H4”最终被cancel掉，就可以了是吗？
-correct.
有没有移民局不允许cancel的可能性？
-No, but sometimes USCIS officer may forget to cancel it and that is why I suggest you to follow-up to make sure the H4 is cancelled.
有人说，有可能H4后来批了，会把先前转的H1 invalidate 掉，在时间上有什么要注意的问题吗？
-Yes, but the H1 takes more time to be approved unless you use premium processing. So, as long as you get the H4 receipt, immediately write a letter to request USCIS to withdraw it.
还有，要告诉新公司的律师吗？还是让lg的律师来cancel（既然是lg的律师提交的），
-Yes, had better talk to the lawyer and ask him/her to contact USCIS to cancel it.
还是最好自己办cancel
多谢,多谢，对不起问题太多，最近真的是焦头烂额。。。。
