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从4月3号起还可以停留6个月吗？还是只能 停留3个月了（因为1月到3月我用F1已经停留3个月）？谢谢
-Was there a entry stamp on your passport or did you got your I-94 at port of entry? That stamp should tell you when you should leave US. If no, you may check this website to find your I-94, and you need to leave US before the I-94 expires:
https://i94.cbp.dhs.gov/I94/#/home