1 、過去完成時(shí)是一個(gè)相對(duì)時(shí)態(tài)，表示過去的過去，只有在兩個(gè)過去發(fā)生的動(dòng)作相比較時(shí)才可顯示出來。


　　e.g. As soon as we got to the station, the train had left.


　　注：主從句表達(dá)的動(dòng)作緊接時(shí)，即兩動(dòng)作發(fā)生的時(shí)間沒有明顯時(shí)間上的懸殊或空檔時(shí)，主從句都可用一般過去時(shí)。


　　e.g. Where did your brother study before he joined the army?


　　2 、過去完成時(shí)可表示截止過去某一時(shí)間動(dòng)作的總或動(dòng)作的結(jié)束。


　　e.g. By the end of last month. We had reviewed four books


　　By eight o`clock, he had finished his homework.


　　與這個(gè)時(shí)態(tài)連用的時(shí)間狀語常有：


　　by 1985, by eight o`clock, by then, by the end of last month, by the time when, when, as soon as, before 等連詞引導(dǎo)的時(shí)間狀語從句，表示主句動(dòng)作結(jié)束的時(shí)間。


小學(xué)一年級(jí)英語語法 一般過去時(shí)現(xiàn)在完成時(shí)


　　一般過去時(shí)現(xiàn)在完成時(shí)主要用于：


　　1 、表示到現(xiàn)在為止這一時(shí)期中發(fā)生的動(dòng)作或情況，即多次動(dòng)作的總和。


　　e.g. We have learnt four English songs this month.


　　How many times have you read the novel?


　　For many days we haven`t seen each other.


　　2 、表示對(duì)現(xiàn)在有影響的某一已發(fā)生的動(dòng)作。


　　e.g. The delegation has left 代表團(tuán)已經(jīng)走了（說明現(xiàn)在不在這里）


　　Look, what you have done. 看你干的事。


　　與這一時(shí)態(tài)連用的時(shí)間狀語有：


　　already, yet, just, ever, never, by now, so far, recently, by the end of this month, since, for 短語，連詞 since 引導(dǎo)的時(shí)間狀語從句。


　　一般過去時(shí)與現(xiàn)在完成時(shí)的區(qū)別：


　　一般過去時(shí)：重在說明動(dòng)作在過去發(fā)生時(shí)的具體情況（時(shí)間、地點(diǎn)、方式、對(duì)象、細(xì)節(jié)等）。