She is a middle school student.的意思是什么?

我这里有两句话：1、My uncle is a teacher in a middle scho我这里有两句话：1、My uncle is a teacher in a middle school in Ji'nan.2、she's an English teacher at a middle school.我有几个问题：1、第一句话中为什么要用in she is a student____NO.2 Middle School she is in a middle school Liiy is a middle school student.she is s____. 把a school middle is student she 连词成句 She is a middle school student.的意思是什么? she is in a middle school是什么意思,谁知道 There is a middle She teaches in a middle school in Beijing.为什么这个句子不用is .She is teaches in a middle school in Beijing. 帮我看看这篇英语自我介绍有没有错误!good morning every body I am very glad to introduce myself to all of you .my name is liruixian.I am 16.I come from No.2 Middle scool.it is no doubt that I am happy to be a member of No.1 Middle Scho she is a student () No.1 Middle School.A:in ,N:of C:at She is a stdent No .1 Middle School .A.forB.ofC.underD.with She is _7_ No.5 Middle School.A.at B.on C.in a,is,in,an,school,English,she,middle,teacher(连词成句) His g___ is a middle school student.(女的)She…… a,is,in,an,school,English,she,middle,teacher,连词成句. 英语连词成句：a,is,in,an,school,english,she,middle,teacher. isnt your sister a nurse?____she teaches english in a middle schoolAno,she isnt B yes she is