新概念第二册73课读后感收集(4)

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.