为什么不能说a day,而要说one day

为什么不能说a day,而要说one day in a day or two与in one day or two的区别?He will be back in a day or two为什么不能说He will be back in one day or two? 为什么不能说“After it seemed to be a long time”而要说成“After what seemed to be a long time ” 为什么用“what”而不用“it”. 为什么不能说i like you very much,而要说成I really like you. 为什么不能说法律是公民意志的体现 而要说是人民 every后面不是加单数可数名词,为什么要说every means 而不能说every mean? 为什么骂人会说B这个字母?B这个字母是怎么来的呢?为什么骂人不说A、C、D之类的而要说B呢? 为什么要说the/a two-year-old boy 不能说two years old boy 新概念英语 不能说my this a pen?要说 my pen?为什么? He only has a dictionary为什么不能这么说只能说one dictionary那么，不能说He is only a boy要说he is only one boy了？这句话当然有意义了Don't laugh at him,he is only a boy. 巴士要来了,为什么不能说There is coming the bus.而要说 There comes the bus 我想问为什么不能说if you listen to me,i will give you some advice而要说成 急 为什么要说 We both didn't speak .而不能说 We neither spoke.新概念2 lessons14 课后题structure7 「幽默感」是一个什么词?为什么不能说 「有幽默」 而要说 「有幽默感」? (选B）___________,and you are sure to win the competition.A.To be confident B.be confidenti wonder if i can book a room with a good ______选AA view B scene C scenery D sight为什么不能说 cut forests 而要说 destroy forests It will take us ____to finish the workA.a day or two B one or two day C a day and two D one or two days.为什么? 高一英语从句Is this the museum (/)you visited the other day?A./ B.Where C.in which D.the one为什么不能选DIs this museum (the one) you visited the otherday?A.that B.where C.in which D.the one为什么不能选A求这两题的详解, 为什么气候变化要说 climate change而不能说是changing climate?