新概念英语青少版4A：Unit 7 Too late 课件（20张PPT）

课件20张PPT。Unit 7 Too LateListening and Understanding The plane was late and detective were waiting at the airport all morning. They were expecting a valuable parcel of diamonds from South Africa. A few hours earlier, someone had told the police that thieves would try to steal the diamonds. When the plane arrived, some of the detectives were waiting inside the main building while others were waiting on the airfield.Listening and Understanding Two men took the parcel off the plane, and carried it into the Customs House. While two detectives were keeping guard at the door, two others opened the parcel.Listening and Understanding To their surprise, the previous parcel was full of stones and sand!Listening and UnderstandingWords and Expressionsdetective 侦探
The detective turned up some new clues to the case. 侦探发现了这个案子的一些新线索。expect 期待
I expect her later.
我预计她迟到。Words and Expressionsdiamond 钻石
She wore a diamond heart around her neck.
她的脖子上挂着一颗钻石鸡心。Words and ExpressionsThief 小偷
The dogs were smelling round; perhaps they smelt the thief.
那些狗在到处嗅， 也许它们嗅到了小偷的气味。Words and Expressionsparcel 包裹
She dashed the parcel aside.
她把包裹掷在一边。Words and ExpressionsCustoms House 海关
Two men took the parcel off the plane and carried it into the Customs House.
有两个人把包裹拿下飞机，进了海关。Words and Expressionsbe full of 充满
Words and ExpressionsGuided ConversationSome detectives.
Yes, they were.
Diamonds.
From South Africa.
Yes, they did.
Yes, they were.
On the airfield.
Two men did.
Into the Customs House.
Two detectives were.
Two other detectives did.
Pattern Practice一个句子中发生在过去的两个事情之间的时间关系。其中，正在进行的状态或动作用过去进行时，而插入的事件用一般过去时。
句型1 I broke it while I was skiing. 用while 引出被打断的动作。
句型2 I was getting into the bath when it rang. 用when引出插入的事件。Pattern Practice句型3 What were you doing all afternoon? 表示发生在过去，并且在一段时间内没有被打断的动作。
句型4 Who knocked over the vase? – I knocked it over. 有些短语动作中当宾语作为名词时，小品词的位置可以改变。Key Structures过去进行时
a 用过去进行时表示一个持续的动作，而用一般过去时表示一个突然发生的动作。其中涉及时间连词when, while, as及just as的用法，例如：
While I was watering the garden, it began to rain.
I was having breakfast when the telephone rang.
持续的动作被突然发生的动作打断了。注意，在以上例句中，时间状语从句即可在句首，也可在句尾，而位于句首时，则需要在后面加上逗号。Key Structuresb while 可以用来表示两个动作同时进行，例如
While George was reading, his wife was listening to the stereo.
George was reading while his wife was listening to the stereo.
c 过去进行时可以用来表示在一定的时间内（如all day, all night等）一直进行没有备打断的动作。
如， Detectives were waiting at the airport all morning.Practicewas leaving… arrived / found… was sitting / was walking… met / was reading… heard/ was setting … heard/ dropped …spoke ReadingNo, she didn’t.
At home.
Because she was too busy to hear it.
He tried to call her all morning.
No, he wasn’t.
She was doing housework and looking after the baby.
She sat down.
The builder.
The roof.
tbaGrammar过去进行时 was/were doing
-用于简单句，如 ... detectives were waiting all morning.
-用于以when, while, as和just as 等连接的复合句，如 When the plane arrived, some of the
detectives were waiting. 其中， 被打断的状态或动作用过去进行时表示，插入的事情用一般过去时表示。