把this the computer room改为否定句

Eat in the computer room.(改为否定句） This is the computer room.改成否定句 怎么改 I think this computer is the cheapest.(改为否定句) This is my room 改为否定句 There is a computer room in the building.（改为否定句） We have a new computer room.(改为否定句） It’s a computer room.改为否定句 It ’ s a computer room.改为否定句 Turn off the computer .(改为否定句 I clean the room改为否定句 1. This is the art room.(怎么改为否定句?) 2.This is a TV.(怎么改为一般疑问句 We have a new computer room.怎么改为否定句.对is on the second floor提