before,ago,after,later用法上的区别RT请在说明一下他们分别所存在的时态

after before in ago later区别时态 after before in ago later时态区别 ago,before,after,until,till等的区别 ago in after before的区别及用法 为何before,after表一点,ago,later表一段? before和ago的区别,later和after的区别 A.after B.before C.ago D.later有什么 区别? He was a famous tennis player ( ) A ago B before C after D then I began to learn English four years(before、after、ago、lafer)（选哪个） She came to see me a week_____A.before B.ago C.after D.later They had bought a house there_______ they moved there.A.before long B.long before C.long ago D.after When ____ the film start?Five minutes______A did,before B.does,before C.did ,ago D.does,after拜 in later after ago before 的区分怎么用举些例子,说明各自表示什么时态before 2 days 还是before 2 days 两者一样还是不同的 英语中反映时间的副词ago对应的反义词是later吗?介词before对应的反义词是after还是begin呢?看形状和中文意思好像是begin,但其实应该是after吧!ago→?before→? they have been here ___ two hours ago.A.for B.since C.before D.after 说明理由 before,ago,after,later用法上的区别RT请在说明一下他们分别所存在的时态 He will receive a letter from his father ________ .A.before long B.long ago C.after D.long before四个选项分别是什么意思. before和ago的区别?