ls this your mobile作肯定回答

ls this your mobile作肯定回答 ls this your book ?（作肯定回答） 英语ls this your ls this your ls this your school? ls++this++your++school是什么意思 ls she your grandmother?作否定回答 Ls she your daughter?作否定回答 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 ___.Is this your mobile phone? ls she your grandmother问号 【作否定回答】 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