Unit 3,Is this your pencil,Introduce,Look! Whats this? Its a book. Is this an English book? Yes,Whats this? Its Is this,Words,pencil /pensl,名词，意为“铅笔”。 复数：pencils。 短语：a pencil 一支铅笔,小练习：给图片选择正确的英文意思,_,A. pen B.pencil,B,Expressions,isnt = is not,意为“不是”。课文应用：No, it isnt,小练习：（ ）Is this your book? No,it _,A.isnt B.is,A. 与no相对应应有not,A,pencil case,意为“文具盒”。 eg：There is not a rubber in my pencil case. 我的铅笔盒里没有一块橡皮,小练习：( )My rubber is in my _. A.pencil B.pencil case,B,Expressions,Expres
