kate is an english.she is an english student .

kate is an english.she is an english student .
kate is an english.she is an english student .

kate is an english.she is an english student .
不对,第一句有误,可以改成：
Kate is English.She is an English student.
English做名词时,意思是“英语”,做形容词时,意思可以是“英国的”.
所以可以说：Kate is English.凯特是英国的.
不能说Kate is an English.凯特是一个英语?
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对啊

Kate is English, she is an English student.