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亲戚送女儿来读初中，到了机场才发现忘记带I20，没有经验的她们也没太在意，就上飞机以旅游签证入境了（之前的旅游签证还没过期）。
学校1月开学，她们打算3月回国一次再换F1。我说这样估计不行的，学校会查签证，请大家看看我说得对吗？
-You are right. She can not attend the school with B-2 status, otherwise she will have big trouble later.

如果必须要以学生身份入境，她们可以做邮轮到巴哈马，回来时候要求入境处以学生身份让小孩入境吗？
-Yes if she has a valid F-1 visa on her passport, but she needs to have the I-20 (may just ask her family to send her the I-20 which she forgot to bring from China).

还是需要去次墨西哥，从墨西哥边境入境？
-Also fine like 邮轮到巴哈马 and return above.

还是可以直接在美国境内转身份比较容易呢？
-This takes a long time and that means she can not go to the school in Jan. 2015.