回複：非常感謝8老師！接著問個問題

那如果申請請假條的話，最長在國內可以呆多久？

-Do you mean the 請假條 is the reentry permit? If so, it allows the green card holder to sty outside US for less than two years.

申請請假條期間，人必須在美國嗎？

-Yes.

另外， 在幫爸媽申請綠卡的時候沒有申請工卡， 如果是看小孩報稅合法嗎？

-No, it is illegal for them to work. But if they stay in US for > 6 months with you in 2011, they may be considered as your dependents for your tax deduction.

如果現在補交756表是否要另外收費？

-No.

 再次感謝8老師一路以來的熱心幫助！