This is "a ruler".就引号部分提问

This is a ruler.就引号部分提问 This is a ruler.就引号部分提问 This is a ruler(对a ruler提问) ----- -----this? This is a red ruler 用a red ruler 提问 This is a ruler 改为一般疑问句 This is a ruler改为一般疑问句 Is this a ruler.(做否定回答) is,a,this,red,ruler 连成句 this is a ruler 改为复数 this ruler is-----?a:myb:mine this is a ruler.改复数 翻译：and this is a ruler Whis is this?回答A：This is ruler.B：It is a ruler. Is this a ruler.---Yes,this is.（改错） Whose ruler is this? Is this red ruler ( ( ) ruler is this? What's this?This is a ruler.这句有什么错误,