英语啊啊啊把下列改为否定句1、This is a key2、It is black and white3、The jac

把下列句子改为否定句1、Ithink this is right. 2、He cleaned the classroom kitty's hair is long and black改为否定句 What's color is the map?\ This's red pen.\ It's a orange jac 1.My father buys a black car.改为否定句 2.It is a nice pencilcase 英语 句子转换1 This is a watch.改为否定句2 This is my pencil 变为复数句3 It' This is a clock改为否定句 this is letter A.改为否定句 This is a watch.改为否定句. this is a map.(改为否定句) This is a UFO改为否定句 将下列句子变成否定句1The sweater is black and white 2The twins can sin this is a black cat.改否定句怎么改