2016年衛(wèi)生類職稱英語(yǔ)備考時(shí)態(tài)之過(guò)去進(jìn)行時(shí)：

過(guò)去進(jìn)行時(shí)：過(guò)去進(jìn)行時(shí)表示過(guò)去某一時(shí)刻或某階段正在進(jìn)行的動(dòng)作。

①過(guò)去進(jìn)行時(shí)由“was(第一、三人稱單數(shù))或were(第二人稱單數(shù)和各人稱的復(fù)數(shù))+現(xiàn)在分詞”構(gòu)成。

②過(guò)去進(jìn)行時(shí)的時(shí)間狀語(yǔ)有：then, at that time, this time yesterday, at (eight) yesterday (morning),(a year) ago, 以及由when引出的時(shí)間狀語(yǔ)從句。如：He was cooking supper this time yesterday.(昨天這個(gè)時(shí)候他正在做晚飯)/ The little girl was playing with her toy when I saw her.(我看到小女孩的時(shí)候她正在玩玩具)

③用于賓語(yǔ)從句或時(shí)間狀語(yǔ)從句中,表示與主句動(dòng)作同時(shí)進(jìn)行而且是延續(xù)時(shí)間較長(zhǎng)。句子中通常不用時(shí)間狀語(yǔ)。如：She was it happen when she was walking past.(她路過(guò)時(shí)看到事情的發(fā)生)/ They sang a lot of songs while they were walking in the dark forest.(他們?cè)诤诎档纳�林里走時(shí)唱了很多歌)

④也可以表示過(guò)去一個(gè)階段頻繁發(fā)生或反復(fù)進(jìn)行的動(dòng)作,常與always等頻度副詞連用,以表示贊揚(yáng)、不滿或討厭等感情色彩。如：He was always borrowing money from me when he lived here.(他住在這里時(shí)老向我借錢)