请教大师，我老公正在申请EB1-B的绿卡，刚拿到了140，准备申请485。我和孩子们现在在加拿大，我有几个问题：
1． 我们的孩子刚在加拿大上大学，他们是否要与我老公一起申请485，
-Your children has to be physically present in US to file their I-485 and then, apply for/use Advanced Parole (AP) to travel to Canada (AP can allow them to stay in Canada for less than one year). Another choice is that after your spouse get his green card, he can file I-824 for your children to get the immigration visa in a US Consulate in Canada. The third choice is that after they finish their study in Canada, your children can return to US to file I-485 to get to get their green card within US(this is the best choice for your children if they still need more time to study in Canada).
还是可以等到我老公拿到绿卡后再申请？
-This is also OK. See above answer.
他们能否拿到绿卡后继续在加拿大完成大学学业？
-Yes, but they may need to get the reentry permit (RP) to stay in Canada if they need more time to study in Canada (RP can allow them to stay in Canada for > 1 year < 2 years).
2． 我因有特殊情况想等几年后拿绿卡，如我想要作为老公的dependent来申请，可以最迟隔多久申请？
-You can file I-485 any time if you are phyically present in US.
有没有时间限制？
-No.
除了结婚公证，孩子们的出生公证，填写485，还需要准备其它材料吗？
-See
