条件状语从句 ppt课件

We are cleaning the classroom while they are playing the football.
The soldier faces the powder while the beauty powder the face.
While I am washing the floor, you can be cleaning the windows.
As --- 一边……一边, 随着 She was doing her homework as she was listening to the music.
As she grew older, she became more beautiful.
As --- 当……时，指一个动作 紧接着一个动作发生，从句通 常用进行时。
When I opened the window, I saw him come up.
When I have time , I will go to see you.
When I came home, I met an old schoolmate of mine.
He said he would tell her about it when he saw her.
Not …until 可以和 when 互换
Before --- 在……之前
The passengers should arrive at the airport an hour before the flight departs.
Did you work as a stewardess before you come to this company?
As I was going out, it began to rain.
I saw Mary as she was going on the bus.
As he was eating his breakfast, he heard someone knock at the door.
Someone patted me on the shoulder as I was standing before the shop window.
While ---在……期间，往往指 一段时间。
While we were in America, we saw him twice.
While we were talking, he came in. Strike while the iron is hot.
While ---表示一种不满情绪， 意思是这边在干某种重要的事， 而另一边在享受等。
1.时间状语从句： 引导时间状语从句的连词有：
when, while, as, the moment, before, after, till, until, since, as soon as 等。
请注意 when, while, as 的区别
When ---当……时候, 通常指 某一特定的时间点，主句与从 句的动作同时发生。
定义：
在复合句中由从句表示的状语 称作状语从句，它可以用来修 饰谓语（包括非谓语动词）、 定语或状语，或是整个句子。
准确掌握每一个连词的含义 是掌握状源自文库从句的关键。
同时要注意主从句的时态呼应。
状语从句一般分为九大类
状语从句类别:
时间状语从句 地点状语从句 原因状语从句 目的状语从句 结果状语从句 条件状语从句 方式状语从句 比较状语从句 让步状语从句
I was about to fall asleep when my sister came in.
One evening, little Hans was sitting near the fire when he heard a loud knock at the door.
When 当从句是进行时，主句 是一般时，往往表示不满。
*注意：在时间状语从句中，主 从句都是将来的动作或状态时， 习惯上主句用将来时，从句用 一般现在时。
When --- 正在……的时候，突 然…。通常主句是进行时或 be about to 时，在翻译的时候， when 可以译成没想到或突然。
I was walking along the street , when I met him.
The plane took off after the air traffic controller gave clearance.
Someone knocked at the door when I was having breakfast.
When I was leaving the house, the postman arrived.
When=after
When the children had gone to bed, she began to prepare her lessons.
He ran off before I could stop him.
It was not long before I forgot it all.
(It was /will be …before… 是常用句型)
After --- 在…… 之后
The customer left the ticket counter after he had a quarrel with the ticket agent.
The moment --- 一……就…… =as soon as , immediately,
---Did you remember to give Mary the money you owed her?
---Yes, I gave her the moment I saw her.
Not… until --- 直到……才 He didn’t leave the office until he finished the work. =He left the office when he finished the work.