This is.（疑问句并否定回答）

This is.（疑问句并否定回答） This is my ruler.（疑问句并否定回答） This book is mine .一般疑问句,并否定回答 this is my tiger变疑问句,否定句,并回答 This is a teacher's desk(改为一般疑问句,并作否定回答.）求教 This is my good friend.（改为一般疑问句并作否定回答） This is a key.(变成一般疑问句,并作否定回答） This is aruler.（改为一般疑问句,并作肯定和否定回答） This is a ball.（改为一般疑问句,并作否定回答） This is a photo of Tony's family.（改为一般疑问句,并作否定回答） this is my school.(一般疑问句,否定回答） This is my sister,Jenny.(改为一般疑问句并作否定回答）Those are his notebooks(改为一般疑问句并作肯定回答） This is yellow flower改一般疑问句怎么改并肯定回答和否定回答.急 this is tom is eraser.变成一般疑问句并作否定回答 This is your dad.（改为一般疑问句,并做否定回答）（）（）your dad?（）,（）isn't. This is our school 的一般疑问句并作否定回答怎么改? This is my friend改为一般疑问句并作否定回答 this is a book 改成一般疑问句 并做否定和肯定的回答