請問8老師和大家，如果以B2 visa入境，想上學，有有效的F1簽證（兩年前拿到，5年有效），如何調整身份？必須回國再入境嗎？
-You can either file I-539 for change of status within US (it takes a long time) or just go out of US and reenter US using the F1 visa. I strongly suggest you to go out of US and reenter US using F1 visa up to 30 days before the new I-20 is effective (i.e. before the semester starts), thus you can study immediately as an F1 student.
可不可以從加拿大或墨西哥以F1簽證入境？謝謝！-Yes.
