ls this your book ?（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 ( ) english book?( )中填啥? ()25.ls this ___________ English book?A.a B.l C.your D.you ls++this++your++school是什么意思 ls this a book Yes,this is.谁会修改? 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 把下面的句子变为复数形式1.This is my sister2.That is his brother3.what is that4.Ls this your friend5.that isn't a book He is Lily's uncle 【改成否定句】 ls this her book [改为复数】 the is your boy brother [连词成句】 ls this your pen?yes,itisn't 哪里错了? ls this your pen?(改为肯定句）