Where are my pens?请问这句为什么不用IS而用are?

Where are my pens?请问这句为什么不用IS而用are? Where are the pens?还是 Where are pens? our pens are here.where are t These are my pens同义句 These pens _______ Those are my pens改为一般疑问句 Those are my pens.变一般疑问句 there are()pens in my pencil box those are my pens.否定句 Where are yuor pens and pencil case.什麽意思? where are ——(they)pens?用适当形式填空 英语句子where are the pens怎么变单数 请问一下whose pens are these回答除了they are her pens是否还能回答成these pens are her或these are her pens? 请问是where is my clothes?还是where are my clothes clothes是可数名词吗 请问是where is my clothes?还是where are my clothes clothes where are my where are my flowers? Where are my They are my colour pens.(变成一般疑问句）-------they-------colour pens?