1. 单词讲解

detective n.侦探
- detect v.探测
valuable adj.贵重的
- value n.价值
precious adj.珍贵的
main adj.主要的
- the main building
- the main streets / the side streets / the main idea (中心思想)
guard n.警戒,守卫
- keep guard 保持守卫

2. 语法讲解

The plane was late and detectives were waiting … all morning.
- 一般过去时
They were expecting a valuable parcel … from South Africa.
- 过去进行时
  - 形式 : was/were doing
  - 用法 :
    She was reading a book at 11:00 last night.
  - 否定疑问 :
    She was not reading a book…
    Was she reading a book…?
- 补充 :
  While you were sleeping,a thief sneaked in. (过去进行时与一般过去时结合)
A few hours earlier, someone had told the police that thieves would try to steal the diamonds.
- try to do sth. 努力做某事
- try doing sth. 尝试,试图做某事
- 过去完成时
  - 形式 : had done
  - 用法 : 从过去的角度回头看过去的问题
    Before 8:00 yesterday, she had finished her homework. (过去 : yesterday / 之前 : before)
    When he got there, she had leaved she was not there.
  - 否定疑问句
  - 补充 :
    It is 10:00. I have waiting for 2 hours.
    It was 10:00. I had waiting for 2 hours.
A few hours earlier, someone had told police that thieves would try to steal the diamonds.
- 过去将来时
  - 形式 : would do / was/were going to do
  - 用法 : 过去的将来 (过去的之后发生的事情小时候,你长大希望干什么?)
    He said that he would go abroad next year.
A few hours earlier, someone had told the police that thieves would try to steal the diamonds.
- tell sb.sth 双宾语结构
- … that thieves would try to steal the diamonds ( 宾语从句)
  - 写法 :
  - 陈述句变宾语从句?
    I think you are right.
    I think that you are right.
When the plane arrived, some of the detectives were waiting inside … while others were waiting on the airfield.
Two men took the parcel off the plane … carried it into the Customs House.
- take off : 拿->脱离

3. 知识扩展

四种表示过去的时态