Is this pencil your?改错

Is this pencil your?改错 Is this your pencil? this is your pencil Is this your pencil?是什么意思? 单句改错where is your a pencil? is this your 改错 What is this?----This is a pencil sharpener改错 Is this your pencil case中文 Is this your pencil?改为陈述句+复数 This is your pencil.(改为一般疑问句) is this your pencil-box?的答语 Is this your pencil?Yes,t( )you