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had+动词的过去分词(p.p.)定义：表示在过去的某一时间或动作之前已经发生或完成了的动作。即：过去的过去。1.在老师进入教室前,李磊擦了黑板.LiLei______________(clean)theblackboardbythetimetheteachercameintotheclassroom.hadcleaned2.当我们到那儿时火车已经离开了。Thetrain__________(leave)whenwearrivedthere.hadleft构成：“过去的过去（past-in-the-past）”。pastinthepastpastnow过去完成时的判断依据:由“过去的过去”来判定。过去完成时表示“过去的过去”，先发生的动作用过去完成时，后发生的动作用一般过去时。WhenIgottothestation,thetrainhadalreadyleft.Afterhehadfinishedhishomework,hewenttobed.firstfirst过去完成时的否定形式：过去完成时的疑问形式：主语＋hadnot／hadn’t+p.p.+其它.Had+主语＋p.p.+其它?按要求改写下列句子．SimonhadfinishedhishomeworkbeforehewatchedTV.否定句：疑问句：肯定回答：否定回答：Simonhadn’tfinishedhishomeworkbeforehewatchedTV.HadSimonfinishedhishomeworkbeforehewatchedTV?Yes,hehad.No,hehadn’t.与什么时间状语连用？与过去完成时连用的时间状语有：（1）by+过去的时间点。如：Ihadfinishedreadingthenovelbynineo'clocklastnight.（2）bytheendof+过去的时间点。如：WehadlearnedovertwothousandEnglishwordsbytheendoflastterm.（3）before+过去的时间点。如：TheyhadplantedsixhundredtreesbeforelastWednesday.宾从中的用法宾语从句中当宾语从句的主句为一般过去时，且从句的动作先于主句的动作时，从句要用过去完成时。1.在told,said,knew,heard,thought等动词后的宾语从句。如：Shesaidthatshehadseenthefilmbefore.2.表示意向的动词，如hope,wish,expect,think,intend,mean,suppose等，用过去完成时表示“原本…”Wehadhopedthatyouwouldcome,butyoudidn't.固定句式1.Itwasthefirsttime+that等一些固定句型中。Itwasthefirsttimethathehadeverspokentomeinsuchatune.2.hardly...when...,nosooner...than...,Hehadnosoonerlefttheroomthantheybegantotalkabouthim.