ls this your backpack? 改为陈述句

英语ls this your ls this your ls this your school? ls++this++your++school是什么意思 ls this your computer?改为肯定陈述句 ls this your schoolbag的中文是什么 ls this your eraser?做出否定回答 ls this your ruler改为复数句 ls this your backpack? 改为陈述句 ls this your mobile作肯定回答 ls this your pen?yes,itisn't 哪里错了? ls this your pen?(改为肯定句） ls this your pen改为否定回答,怎么改 Excuse me,sir,ls this your school?怎样回答 ls this ruler_?A:yours B:you C:your ls this your book ?（作肯定回答） Is this your pencil ls在这句话里是什么意思 连词成句并翻译 your,this,ls,dog?