2016年職稱英語(yǔ)衛(wèi)生類考試時(shí)態(tài)之過(guò)去完成時(shí)：

過(guò)去完成時(shí)：過(guò)去完成時(shí)表示過(guò)去某一時(shí)間或某一動(dòng)作發(fā)生之前已經(jīng)完成的動(dòng)作。簡(jiǎn)言之, 過(guò)去完成時(shí)所表示的時(shí)間是“過(guò)去的過(guò)去”。

①過(guò)去完成時(shí)由“助動(dòng)詞had+動(dòng)詞的過(guò)去分詞”構(gòu)成。

②過(guò)去完成時(shí)時(shí)間狀語(yǔ)有：by (yesterday), by then, by the end of (last…)或者由when,before等引出狀語(yǔ)從句。有時(shí)句子中會(huì)有already, just, once, ever, never等詞語(yǔ),也會(huì)有for… 或since…構(gòu)成的時(shí)間狀語(yǔ)。如：They had already finished cleaning the classroom when their teacher came.(當(dāng)老師來(lái)的時(shí)候他們已經(jīng)打掃完了教室)/ The woman had left before he realized she was a cheat.(在他發(fā)覺(jué)那個(gè)婦女是個(gè)騙子時(shí)她已經(jīng)走掉了)

③過(guò)去完成時(shí)常用于賓語(yǔ)從句中、after引導(dǎo)的從句中,或者從句是before引導(dǎo)的主句中。如：After I had put on my shoes and hat,I walked into the darkness.(我穿上鞋子戴上帽子走進(jìn)了黑暗之中)/ He said that he had never seen a kangaroo before.(他說(shuō)他以前從來(lái)沒(méi)有見(jiàn)過(guò)袋鼠)