我妈妈拿B-2先来美国,然后我可不可以在我申请公民的同时给我妈妈申请绿卡? -No. You need to become a US citizen first and then, sponsor your mother's green card application later. 现在大约要等多长时间? -It may take about 6 months for you to become a US citizen, case by case. 谢谢!