英语中该怎么做否定回答is this a ruler?

英语中该怎么做否定回答is this a ruler? Is this a ruler.(做否定回答) This is a busy street ,right?做否定回答! is this a teacher,s desk?怎么作否定回答? Is this your brother?(做否定回答) Is this your friend?做否定回答 This is a robot.改为一般疑问句,否定句,做否定回答 this is an orange jacket咋改否定句?is this a map?做否定回答?急shi了! 英语否定句：IS this a teacher's desk? 否定回答是? This is a dictionary (作否定回答 Is this a kite?否定回答 Is this your ball?否定回答怎么回答 this is a book 改成一般疑问句 并做否定和肯定的回答 This is a big fanily.改为一般疑问句并做肯定和否定回答 This is a computer.改为一般疑问句,并做否定回答 is bob a boy?做否定回答 This is my dictionarg?变一般疑问句并做否定回答 This is his book变否定句Thes is a my ID card 改错 Is this an English stamp做否定回答.