This red pencil____Lucy's.She likes red very much.A.must be B.must is C.can be

Is this red ruler ( I like this red ball.this red ball划线提问 this apple is red对划线部分red的提问 This is a red ruler 用a red ruler 提问 This red bag is mine.对red提问 This is a red book.对red提问怎么答? is coat this red连词成句 leet this is red 连词成句 this apple is red改为复数句 This desk is red 改为选择疑问句 This desk is red 改为反义疑问句 Is this a red car nice?改错 用this,red,and,that,biue造句 is this coat red or 0.0+++ this sweater is red 改为同义句 This is a new red jiji This shirt is red.一般疑问 whose is this red case意思是什么?