I am a Chinese

I am a Chinese. i am proud i am a chinese I am a chinese还是I am chinese正确 是i am a chinese 还是 i am chinese I am a Chinese还是I am Chinese I am a Chinese和I am Chinese哪个对? I am Chinese.I am a Chinese.哪个句子正确 英语作文.I am proud I am a Chinese I am a Chinese girl I am Zhang Yingyi I am proud Im a Chinese评改 I am a Chinese[改为复数句】 I am Chinese.中Chinese前用不用加a?