ls this your pen?(改为肯定句）

ls this your pen?(改为肯定句） ls this your computer?改为肯定陈述句 ls this your pen改为否定回答,怎么改 ls this your ruler改为复数句 is this your pen（变为肯定句） ls this your book ?（作肯定回答） Is this your pen变成肯定句和否定句 ls this your mobile作肯定回答 ls mr hu tall?(改为肯定句） Is this book in your schoolbag?(改为肯定句） Is this your dictionary?改为肯定句 This is not my pen.(改为肯定句)