为什么是one year ago而不是ago one year?one year ago的话词性上来讲说不通啊

为什么是one year ago而不是ago one year?one year ago的话词性上来讲说不通啊 One Year Ago 歌词 he has kept a car since one year ago（对since one year ago 提问） my birthday is my favourite day of the year为什么是“of the year,而不是of a year”? i was a student one year ago.(变成一般疑问句）（ ）（ ）a student one year ago? ____last year ,this shopping mall is one of the biggest in our city为什么是opened而不是being opening 为什么是thirty years ago 而不是thirty years before? last year he left the house quietly without saying a word为什么是quietly 而不是quiet 有关高中英语的几个小问题I'return the book to the library as soon as I have finished it问什么是have finished 而不是finish2:Is this museum the one you visited a few days ago 为什么是the one 而不是that for one year=since one year ago=如上,还等于什么（）is a year() “一年前”翻译成英语应该是a yearr ago 还是one year ago?一月前呢 half a year ago. 为什么是since two years ago 而不是for two years ago 1.Are you gong to work in Wenzhou ()?a.in five years b.three years ago c.now d,justAre you gong to work in Wenzhou ()?a.in five years b.three years ago c.now d,just now 需理由为什么是aI have a car now.But I（）one last year.A.didn't B.do One swallow doesn’t make a summer,为什么是summer,而不是spring、、? one year ago 和a year ago 没有任何区别吗?可否说明一下：one 和a 在任何情况下都可以互换的吗? A Year Ago Today 歌词 A Year Ago Today 歌词