用法

一、過(guò)去進(jìn)行時(shí)的主要用法是描述一件事發(fā)生的背景;一個(gè)長(cháng)動(dòng)作發(fā)生的時(shí)候，另一個(gè)短動(dòng)作發(fā)生。常用的時(shí)間狀語(yǔ)this morning, the whole morning, all day yesterday, from nine to ten last evening, when, while

We were watching TV from seven to nine last night.昨天晚上七點(diǎn)到九點(diǎn)的時(shí)候我們在看電視。What was he researching all day last Sunday?上周日他一整天都在研究什么?My brother fell while he was riding his bicycle and hurt himself.我哥哥騎自行車(chē)的時(shí)候從車(chē)上摔下來(lái)，受傷了。It was raining when they left the station.他們離開(kāi)車(chē)站的時(shí)候天正在下雨。When I got to the top of the mountain, the sun was shining.當我到達山頂的時(shí)候，陽(yáng)光燦爛。

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