I am queen.为什么不用加a?

I am queen.为什么不用加a? i agree为什么不用在I后面加AM I am queen ,Not princess I am Chinese.中Chinese前用不用加a? where am I belong to?用不用加to?还有I need a lot of paper to write (on).用不用加on?为什么? l am in ___ Chinese middle school.为什么这里要填a 而I am in ___No.11 Middle School却不用加冠词? I am a Chinese girl.为什么不用:I am an Chinese girl. I feel like I am a poor man and you are the queen翻译 I am busy yesterday为什么加am I am not Chinese boy I am not a Chinese 为什么后者要加a那 I am a king ,and you are my queen你知道这是什么意思嘛? I am worker 为什么要在worker前加a? I am French.中French前为什么不加a? i am excited 为什么不用exciting 为什么要说If I were a fairy,而不用If I am a fairy? i am fish清华少儿英语书上有一个句子,I am fish.I can swim,I can't fly.为什么不用 I am a fish? I am a better swimmer than he为什么要加am a what( )imporant work I am proud its( )useful job/ a.为什么不用 a an