please give me a correction

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I know (认识) a girl whose father has lived in America for many years and has obtained a green card. Her mother was （已经被允许了吧） permitted to reunite with him. The girl was （因为弟二段说”many years later", 第一段不可以说"is"，因为整段是过去式）waiting for confirmation （比'news'自然一点) that her mother can take her abroad, however, when her mother contacted her, it was （"it was"就是指“原因是。。。”） to tell her that she has a new baby brother. Because of her new baby brother's impending arrival, everyone ignored(/forgot) the fact that she was meant(/supposed) to be coming.

More than a year later, she (finally) went to America to study （"transferred to study abroad"这句话不强调她要去哪儿。因为她一直想去美国，这句话应该包括“America"). Touching the new (new听起来是新买的，但是你想表示的是这些家具是不熟的，对吗？） unfamiliar furniture （furniture has no plural form), and seeing her father who she hardly recognised ("如果她真的从来没有见过她父亲，你应该在第一段说一说。因为”a girl whose father has lived in America for many years"的含义就是她以前跟父亲在一起，但是由于某些原因，他搬家了到美国), she found herself feeling like a stranger in her own family. (在这句话里用'her own family"强调家庭感的缺乏)。

Her biggest problem is language(/communication). She never learned English in her home country. Her level of English is equivalent to a seven year old. She can't even introduce herself, (这个说法自然一点), let alone understand the content in class. The kind teacher experiments with her in class by giving her a pen and allowing her to draw freely. (这最后的句子我不太明白。可不可以给我翻译一下?)

(4) Let alone 这个语法点，连接两个句子。正确用法就是在 "let alone"的前面，必须是否定式。所以，"She can't even introduce herself/she can't even get through her self-introduction, LET ALONE understand the content of the class.

(5) in the country 是“国内”, 对吗？在英语上我们不会这么说。你可以说: "in her home country", "in her home town", "at home" (at home有的时候也是指自己的国家)

Interesting story! It made me want to continue reading and find out what happens. 加油，朋友。