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父母有綠卡，去年十月底回中國，原計劃三月底回美，正好五個月。 現在因為疫情， 航班取消。 父母倒也不急著回來。 如果想到今年年底再看情況，請問是否需要申請什麽手續？ 謝謝您

-If your parents come back to US before their stay in China reaches one year, then they just use the green card to reenter US, notthing else is needed to do. But if they cannot return US after October due to the covid-19, their green card will be void. Thus, they may have to apply for SB-1 and this is a very cost processing in time, money and risk.