This is his ruler.改为否定句.是不是This is not his ruler.

This is his ruler.改为否定句.是不是This is not his ruler. This is his ruler.(改为否定句) this is his ruler This is my ruler.His ruler is not an old.--------- --------- his,is,this,not,ruler.连词成句 This is my ruler (改为否定句) Is this ruler?(改为否定句） Is this his sharpener?改成肯定句 还有That is her ruler改成否定句! [紧急求助]This is a ruler.改为否定句 This is his ruler(改为复数句) That is my key(改为复数句) These are his this is my ruler改成否定句 This is my ruler 的否定句