Is this ruler?(改为否定句）

Is this ruler?(改为否定句） This is my ruler (改为否定句) This is his ruler.(改为否定句) [紧急求助]This is a ruler.改为否定句 This is his ruler.改为否定句.是不是This is not his ruler. The ruler is yellow.(改为否定句) this is my ruler改成否定句 This is my ruler 的否定句 Is this your ruler?改为同义句 Is this her ruler?改为同义句. This is her ruler.(改为否定句和一般疑问句) ___ ___ ___ her ruler.____ _ 英语作业,帮帮忙1.This is a ruler.(改为一般疑问句.并作否定回答）____ ____ a ruler?