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尺子尺子I have a ruler.我有一把尺子。我有一把尺子。I have a pencil.我有一支铅笔。我有一支铅笔。I have a bag.我有一个书包。我有一个书包。I have a book.我有一本书。我有一本书。 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 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Find and matchFind and match用a 或an 填空。I have _ crayon.This is _ English book.I have _ book.I have _pen.I have _ eraser.aaaanan