发布时间：2016-06-21 来源：新东方在线 发布人：
课文详注 Further notes on the text
2．Tommy had already swallowed them! 汤米已经把硬币咽了下去！
句中用了过去完成时形式 had swallowed。过去完成时用来表示过去两个动作中发生在前的那个动作。显然，句中咽下硬币的动作发生在夫妇俩能够把硬币从汤米手中抢过来之前。
3．later that morning，那天上午的晚些时候。
语法 Grammar in use
构成： be的过去式 现在分词。
过去进行时表示过去某时正在进行的情况或动作。过去进行时和一般过去时经常在同一个句子里使用。过去进行时表示过去正在进行的情况或动作，一般过去时则表示比较短暂的动作或事件。过去进行时的时间状语从句一般由when，while及（just）as等来引导，说明主句中动作发生时的背景。此外，可用 while或 at the time等强调同时进行的两种或几种动作。请看例句：
When I was doing the housework, my husband telephoned me from the office.
While I was listening to the stereo, my mother came into the room.
Just as she was cleaning her shoes, George knocked at the door.
While I was cooking the dinner, he was working in the garden.
词汇学习 Word study
Tommy had swallowed the coins.
I tried hard to swallow my doubts.
She swallowed a smile and sat there still.
Our company was swallowed up by an American company last year.
Nazi Germany nearly swallowed up the whole Europe in World War Ⅱ.
When I was opening the front door, the telephone rang.
Yesterday morning, my alarm clock didn't ring at 7 o'clock as usual.
You said you were going to ring me last night, but you didn't.
Somebody is ringing the doorbell.
练习答案 Key to written exercises
1 He knocked at the door when I was answering the phone.
2 He came downstairs when I was having breakfast.
3 The phone rang when I was washing the dishes.
4 The boss arrived when she was typing a letter.
5 The train left when I was buying the tickets.
6 It rained heavily when I was driving to London.
1 When he arrived I was cooking a meal.
2 When he arrived I was washing the dishes.
3 When he arrived I was working in the garden.
4 When he arrived I was typing letters.
5 When he arrived I was shaving.
6 When he arrived I was boiling the milk.
7 When he arrived I was phoning my sister.
8 When he arrived I was dusting the bedroom.
1 While I was cooking the dinner, he was having a wash.
2 While I was cooking the dinner ,he was watching television.
3 While I was cooking the dinner, he was cleaning his shoes.
4 While I was cooking the dinner, he was listening to the radio.
5 While I was cooking the dinner, he was changing his suit.
6 While I was cooking the dinner, he was sitting in the dining room.
7 While I was cooking the dinner, he was reading the paper.
8 While I was cooking the dinner, he was driving home from work.