she is french 为什么不是 she is a french?

she is french 为什么不是 she is a french? She is French.和She is a French student.为什么后边这句要加冠词a呢? she is a french student中french前面为什么要加a呢? she is a French.的上一句 she is good at French .she has a large v_____ Alica is learning / french.she is suae french is a useful la she is French不加a IS it a French car为 什么要加a is she a French student an a Swedish student? Kate is from Australia.She speaks French. Is she a French student an a Swedish student?这句中间为什么用an连接? 在She is French.中它是形容词.（她是法国人.） 那么She is a French.（她是一个法国人.也应 she is french but she speaks with a perfect english a（根据首字母填