过去完成时 PAST PERFECT怎么样

过去完成时 PAST PERFECT怎么样 为什么过去完成时叫做PAST PERFECT TENSES 肯定有原因的.有来历的rt past perfect用法 past perfect 用法 用present perfect tense ,simple past tense , 求 past | past perfect | present perfact 的分别RT Simple past和past perfect那个较早发生 present simple,present continuous ,past simple ,past continuous ,past perfect每个时式作一句句子, 过去完成时怎么改成一般过去时 什么时候该用 present perfect 什么时候该用past simple? in the past three years是用过去完成时还是现在完成时? use present perfect or simple past tenses:Theuse present perfect or simple past tenses:The Titanic.(sink) in 1912. Simple past VS.present perfect PS:耀快~Use the simple past of___________________________________________.Use the present perfect for_______________________________________. present perfect tense,past perfect tense两者的用法,用中文答 英语present perfect simple跟past perfect simple 有什么区别? in the past few years 过去完成时 in the last few years 现在完成时 in the past 一般过去时 请问present/past perfect tense 跟present/past perf请问present/past perfect tense 跟present/past perfect continuous tense 有何分别?当做时态练习时,如何清楚介定它们.（它们有哪些标示语） perfect