ls that your ruler?改为陈述句

ls that your ruler?(改为陈述句） ls that your ruler?改为陈述句 ls this your ruler改为复数句 ls that your brother翻译 ls that your baseball?变为复数句 ls that your key ?(改为复数) That's his ruler(改复数） is that your ruler 做肯定回答 Is that your ruler?做否定回答. It that your ruler?(同义句) ls this your pen改为否定回答,怎么改 ls that 句型转换：ls that your watch?(复数句)(句型转换：ls that your watch?(复数句)( )your( ls that your skirt?用复数形式提问.ps: ls that your mother in the photo ?什么意思 翻译初一英语:tom,sonia,jane and other students are in their classroom .they suddenly find a pencil case ,a ruler and an eraser on the floor .tim ask sonia ,''ls this your pencil case?''sonia answers ,''yes ,thank you ,and that is my ruler ''tim this isn't your ruler that ruler is------------he her hers its Helen,is that your classmate ruler?哪里错了