Some notebooks are (on the table).对括号部分提问急!

These are some notebooks in my backpack改为单数 There are some notebooks in my backpack.变否定句.some应该变吗?不太懂 为什么这句话错了?（some notebooks are in there)这句话里面 （some notebooks are in there ）的 “in” 改用不该用?为什么? Some notebooks are (on the table).对括号部分提问急! here --- some student's notebooks on the floor(is还是are） There are some notebooks in my study.的否定句、一般疑问句及简略回答? These are my notebooks改为单数 l need some notebooks and pencils的中文意思是什么? 翻译：His notebooks include some interesting drawings of flying machines . --Are these your notebooks? --Yes,these are. 改错 什么are my notebooks?they are on the desk. 单句改错 Aer these your notebooks?Yes,there are. There are three notebooks in the bag.怎么改成问句 these are my notebooks (对划线的提问) where are the pencil case and the notebooks yellow,I,are,their,notebooks,think,these.连词成句 yellow,I,are,their,notebooks,think,these.连词成句, are,notebooks,those,mine,purple连词成句