1、H1被裁,怎樣轉H4?有什麽手續?需要請律師嗎?
you can do by yourself, I-539
2、我先生二月將在中國度假,(機票已經定好)他人不在美國,會影響我轉H4嗎?還是他提供材料就行了?
yes, 提供材料就行了, and write a support letter
3、如果我再找到工作,H1=>H4=>H1,還要等H1的名額嗎?
No,
4、Fire 和Layoff有區別嗎?
From immigration point, it is same, you must file before last day.
5、我先生必須於多少天內給我遞交H4申請?
see answer for 4