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语法 Grammar in use
1.过去进行时(The past progressive tense)
构成:be的过去式 现在分词(注意现在分词的构成)
(1)过去进行时主要表示过去某个时刻或某段时间正在进行的动作。过去进行时和一般过去时经常同在一个句子里使用。过去进行时表示过去正在进行的动作或情况,一般过去时则表示比较短暂的动作或事件。正在进行中的动作或情况往往由连词 when, while, as, just as等引导:
While/ When/ As I was sweeping the floor, I found your pen.我扫地的时候,发现了你的钢笔。
while通常只引导持续时间较长的动作,并且主句和从句可以同时用过去进行时,而when和as一般不这么用:
John was watching TV while his wife was talking with a neighbour over the phone.当他的妻子和一位邻居在电话中聊天时,约翰一直在看电视。
Some students were dancing and singing while others were eating and drinking.有些学生在唱歌跳舞,而另一些则在吃喝。
Just as I was opening the front door, the telephone rang.我正开前门的时候,电话铃响了。
Just as I was leaving the house, you came in.你进来的时候我正要出门。
when也可以引导比较短暂的动作,while和as则一般不行:
We were having supper when the lights went out.我们正在吃晚饭时灯灭了。
2)过去进行时往往与表示一段时间的状语连用,如all morning, all night, all day, all evening, the whole week等,表示这段时间一直在干什么:
They were preparing for the party for two whole days.整整两天他们一直在为晚会进行准备。