每课一句：新概念英语第1册第119课
【往期回顾】
接下来，我们就来看看第119课的“每课一句”。
一、课文原文
Lesson 119 A true story
Do you like stories? I want to tell you a true story. It happened to a friend of mine a year ago. While my friend, George, was reading in bed, two thieves climbed into his kitchen. After they had entered the house, they went into the dining room. It was very dark, so they turned on a torch. Suddenly, they heard a voice behind them. “What’s up? What’s up?” someone called. The thieves dropped the torch and ran away as quickly as they could. George heard the noise and came downstairs quickly. He turned on the light, but he couldn’t see anyone. The thieves had already gone. But George’s parrot, Henry, was still there. “What’s up, George?” he called. “Nothing, Henry,” George said and smiled. “Go back to sleep.”
——选自《新概念英语》第一册，外语教学与研究出版社，1997年10月第1版
二、每课一句
The thieves had already gone.
本课侧重学习的是过去完成时的用法。
（一）构成方式
had done
其中，had是助动词，done是过去分词。
（二）基本用法
表示过去发生的动作或状态，对过去的某一点造成的某种影响或是结果，用来指在另一个过去行动之前就已经完成了的事件。如：
如：
He had left before she came back.
（三）标志词
before+过去时间。如：
He had never ridden a horse before last month.
（四）动词的过去分词的变化规则
1、直接+ed，如：worked, played, aimed。
2、以不发音的e结尾，直接+d，如：live - lived, arrive - arrived。
3、以重读闭音节结尾，双写+ed，如：stopped, crammed。
5、不规则，如：lie - lay - lain, pay - paid - paid。
三、更多拓展
After they had entered the house, they went into the dining room.
注意before与after引导时间状语从句时的区别：
after所在的从句谓语动词是先发生的动作，采用的是过去完成时；其主句动作是后发生的动作，采用的是一般过去时；
before所在的从句谓语动词是后发生的动作，采用的是一般过去时；其主句动作是先发生的动作，采用的是过去完成时，如：
After I had left Shanghai, the war broke out.
Before the war broke out, I had left Shanghai.
