half a day 为何不说a half day

half a day 为何不说half day.类比half apple half a day 为何不说a half day half of students为啥不说a half of 为什么说a fun day 不说a funny day half a day=a half day,那为什么half a dozen 却没有a half dozen 这种说法? he often___(relax) half a day 单项选择 of the boys enjoy the movie,but have no interest in it A Half;the other half单项选择 of the boys enjoy the movie,but have no interest in it A Half;the other half B Halves;the other half C Half ;the other halves D Halves;the other hal For a day and a half last spring 翻译... they spent half a day planting trees的同义句?they spent half a day planting treesit ___them half a day ___ ___the trees? half a a half half a a half 改错 He stayed here one and a half day You spent one and a half( ),but i only took one half ( )A day ,day B days ,daysCdays ,dayDday ,days 快,2分钟内回答追加100分!要写理由!1、Please say something about your trip____ China.A.on B.at C.to D.from2、The market isn't far from here.It's only ____ bicycle ride.A.half an hours' B.half an hour's C.half an hour D.an houur and a hal saturday a working day For me is half day till 12 noon. 一天半 的英文是one and a half days还是one and half days 那1.5 是one and a half 还是one and half一天半可以译为one day and a half吗