This is a watch.改为否定句.

This is a watch.改为否定句. This is my watch改为否定句 this is a watch(改为复数句) this is a map.(改为否定句) this is letter A.改为否定句 This is a clock改为否定句 This is a lion.改为否定句 This is a UFO改为否定句还有This is a letter A 改为否定句 Jack is going to watch a basketball match this Friday.Jack _____ _____ _____ _____ a basketball match this Friday.(改为否定句） Is this a watch?（改为复数句子） Daming is going to watch TV this evening.改为否定句 This is a book.(改为否定句） this is a map of china改为否定句 tHIS IS A MAP OF cHINA.改为否定句 [紧急求助]This is a ruler.改为否定句 this is a bag 改为否定句是什么 this is a bus.(改为否定句） This is a fat boy. 怎么改为否定句