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尺子,I have a ruler.我有一把尺子。,I have a pencil.我有一支铅笔。,铅笔,书包,I have a bag.我有一个书包。,书,I have a book.我有一本书。,英语书,an English book 一本英语书,I have an English book.我有一本英语书。,橡皮,an eraser.一块橡皮,I have an eraser.我有一块橡皮。,a 和 an 都是表示“一个（只、条等等）。区别：an 是用于以元音开头的“a,e,i,o,u.比如：an ereser.an apple.bag,book,a,a,pen 钢笔,a pen一支钢笔,I have a pen.我有一支钢笔。,This is a pen.这是一支钢笔。,Pencil case铅笔盒,a pencil case一个铅笔盒,crayon 蜡笔,crayon,a,一支蜡笔,pencil,eraser,crayon,ruler,Find and match,用a 或an 填空。,I have _ crayon.This is _ English book.I have _ book.I have _pen.I have _ eraser.,a,a,a,an,an,
