she is English后面为什么不加does?

she is English后面为什么不加does? 为什么she is English girl.不加an. Does she teach English?does换is 行吗,为什么 He as well as she is English lovers. is后面为什么加复数? what does she （wear）today wear为什么不加s she is wear 为什么 也不加s 比如说She does not understand English.这里面为什么不用She is 而用she does 为什么We find it necssary that we speak English中it后面不加is? 单复数后面怎么加 SHe does not (wear)glasses!He wears glasses 为什么第一个不 she thinks it a waste of time如何理解,为什么it后面不加is 句子What does your English teacher look like?为什么what后面要加does i am taller than she is后面为什么加is this后面为什么加is,不加are或am