为什么不是she is an afraid girl

He is an ill man .She is an afraid girl 为什么着2句是错得?麻烦谁能讲讲这2句的 She is afraid of dong 为什么不是afraids She is an good girl. She is an English girl. 为什么she is English girl.不加an. 为什么是she is an eight-year-old girl?she is an eight-years-old She is an American girl 还是 She is American girl The girl is__(勇敢的).She is afraid of nothing The girl is afraid.. She is an English girl.如何翻译 she is an english girl 【同义句】 she is an ill girl 怎么改一处