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老师你好，

我全家今天收到美国绿卡， 我目前是每天往返加拿大和美国，家人住加拿大。  目前孩子还有一年就高中毕业，他们不想动。

1我们必须要住在美国吗？

-Technically, yes.

如果我们每隔几周来美国住一晚，可以保绿卡吗？

-It may be OK for a short period of time (e.g., less than 6 months). If you want to do it for a longer time, you may have trouble.

You may come to US to apply for the reentry permit which allows you to stay in Canada for more than one year and less than two years. You do not need to wait for the reentry permit approval to leave US. Once you conduct the biometrics, you can leave US during the reentry permit pending (you may indicate in the I-131 application for reentry permit that you want USCIS to send the reentry permit to a US Consulate in Canada after it is aprpoved and then, you can pick it up in the US Consulate.

2.孩子明年上大学， 如果美国大学没录取，只能上加拿大大学， 孩子绿卡怎么办？

 -He may come to US to apply for the reentry permit and stay in Canada and then, come to US to apply for a new reentry permit again before the old one expires.

3.我的H1B，还有两年有效期，可以先用H1b,

还是拿到绿卡， H1B就失效？

-Yes. The H1B status was invalid and you need to use the green card to travel and work in US.

PS， 我在办绿卡期间也我是美国加拿大来回,，家人一直在加拿大，没过来。

-After you all got the green card, the situation has been changed.