A blue pants成立吗,老师说pants是复数,可是又可以写成a pair of pants.我都混乱了

A blue pants成立吗,老师说pants是复数,可是又可以写成a pair of pants.我都混乱了 two blue pants与blue pants 意思一样吗Why? in a blue pants和in blue pants有什么不同急 blue his are pants these . He often in a blue shirt with pants.这句话哪错啦 A:I'll take those blue pants.Fifteen dollars.Here you are.B:OK.Here_____your______ that,用做代词的用法老师只说that用于只代前面说过的名词单数,复数those,我在网上看到一个句子,The price of the blue pants is far higher than that of the green pants. 前面一个that是只代the price ,后面一个gree these pants are blue.划线提问 These are blue pants.同义句 This pants are blue 改成特殊疑问句 A pair of blue pants{}go with a pair of brown shoes请说明为什么,并翻译, My pants are blue（对blue提问） （ ）colour are( )pants? 条件概率：P(B|A)≥P(B)P(B|A)≥P(B)一定成立吗?或者什么时候成立? 在概率论中,P（A-AB）=P（A）-P（AB）成立吗? 以My friend为题,根据所给的提示词语,展开合理的想象,写一篇60词左右的短文.提示词语：a boy/girl,fifteen years old,birthday,music and P.E,interesting,a blue backpack/$6,a white T-shirt/$12,black pants/$8,on weekends,playba How much are the blue pants 的意思是什么? The blue pants look like-------.(you)Please put -------away.(they) His pants are blue(改一般疑问句）