为什么不能写He is an English?

为什么不能写He is an English? 为什么不能说He is an English 为什么不能说he is an english? He is an Englishman.为什么不是He is an English.可不可以He is a Chineseman. Is there any correlation at all between success as a young person and success as an adult?120 engli He has____idea.it is _____good idea.A.an the B.the the C.an a为什么第二个空不能填the 七.年.级.（用括号内所给动词的正确形式完成短文）Bill Cray is an Australian boy.He ___1__(study) at Darwin School.His father is a worker.He __2___(work)in a big car factory.His mother ___3__(be) a teacher.She _____4__(teach) Engli He is American.I am English.为什么不能加冠词He is American.I am English.和He is an American.I am a Englishman.的中文是不是没有区别呢 He is an astronaut （变为复数句子）?怎么写? He is an English Feeding animals is ____interesting work.请问为什么不能填an He is having an affair..为什么不说 He has an affair. 为什么不能说he will leave after an hour?要用in an hour? he is an 8 years old boy 为什么不对 he is an american=he is ( ) ( ) he is not what he used to be 为什么不能how he used to be 请问he is an ordinary worker和he is a common worker 请问he is an ordinary worker和he is a common worker 为什么答案是he is an ordinary worker what does he mean为什么不能说what is he mean为什么去掉he 可以说 what is mean