ls this your ruler改为复数句

ls this your ruler改为复数句 ls that your ruler?(改为陈述句） ls that your ruler?改为陈述句 ls this your computer?改为肯定陈述句 ls this your backpack? 改为陈述句 Is this your ruler?改为同义句 ls this your pen?(改为肯定句） ls this your pen改为否定回答,怎么改 英语ls this your ls this your ls this your school? ls++this++your++school是什么意思 is this your ruler? 改为复数句 Are these her erasers?改为单数句 把下列句子改为复数句子That is my sister Ls this his parent Ls she your friend Yes it is This is my cup 急 ls your last name Smith?改为陈述句 ls that your key ?(改为复数) Ls she your cousin改为复数形式 what color is your ball 改为复数句 ls this bike yours ?（用your改写句子,意思不变）求助