This pair of pants .为什么不用these

This pair of pants .为什么不用these This is a pair of pants.和they are pants. I'd like()on this pair of pants填空 this pair of pants is 20yuan.为什么用is? 英语在线改错This pair of pants are my favorite. This pair of pants (be动词) Eric's. This pair of pants is a little short for me. Please give me a l____ pair. i want a pair of pants _________my daughter my daughter___ _____ this pair a pair of brown pants This pair of pants are my favorite.(改错)This pair of pants are my favorite.( )_____ ____ ___ __A B C D Where are the black pants?为什么用are Whose is this pair of pants?为什么用 is Where are the black pants?为什么用are Whose is this pair of pants?为什么用 is What does he think of this pair of pants?同义句转换 this pair of pants ___ big and the pants there___ small.A,is ,are b are ,are How do you like this pair of pants?（同义句转换） How do you like this pair of pants?(同义句转换) This pair of pants _20.50 yuan.空格处填is 还是are? This pair of pants is mine.Hers _______ （be) over there. This pair of pants (be动词) Eric's.这句话的主语是?