(时间状语从句)-PPT

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【典例2】Henry will give us a report as soon as he ______.
A. arrives
B. arrived
C. is arriving
D. will arrive
解析
考查时间状语从句连接词。句意：亨利一回来就给 我们作报告。as soon as为时间状语引导词，遵循 “主将从现”原则，故答案选A。
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语法加油站
总结本单元的语法知识，你掌握了吗
3. as 1）表示“当……时”、“和……同时”。从句中多用表示动作 的动词，而不用be动词或表示感觉、理解、知道这类动词。 She dropped the glass as she stood up. 2）用于平行的动作中，表示“一边……一边……"。常指一 个主语同时进行两个动作。
as: 1. She came up as I was cooking.（同时）
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易错点3 when/while/as的区别 when:
1. When we were at school, we went to the library every day. （在一段时间内） 2. Sorry，I was out when you called me.（call为短暂性动词） 3. When I got to the airport，she had left.（got to后发生）
He sang as he worked. 3）用于平行发展的结构中，表示"随着……"。 As it grew darker it became colder. As he grew older he became more confident.
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17
语法加油站
总结本单元的语法知识，你掌握了吗
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语法加油站
总结本单元的语法知识，你掌握了吗
时间状语从句
1. when 表示“当……的时候”。从句中既可用延续性动词，又可用非延 续性动词。从句中的动作既可和主句的动作同时发生，又可在
主句的动作之前或之后发生。
如：
When I came into the room, I found him lying there asleep.
就……）等。
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时间状语从句的分类
Mary cut her finger when she was making a kite. As she was reading the newspaper, grandma fell asleep.
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时间状语从句的分类
2. 表示先后，即主句的谓语动作发
Mary was having dinner when I saw her.
When you meet a word you don't know, look it up in the
dictionary.
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15
语法加油站
总结本单元的语法知识，你掌握了吗
2. While while表示"在……的时候"、"在……期间"。它强调主句的动 作与从句的动作同时发生或主句的动作发生在从句的动作过 程中。while从句中必须是表示动作或状态的延续性动词。 如： The weather was fine while we were in Beijing. While we were swimming someone stole our clothes. While my wife was reading the newspaper, I was watching TV.
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易错点3 when/while/as的区别
while:
1. When ／While ／As we were dancing，a stranger came in. （dance为延续性动词） 2. Please don’t talk so loud while others are working. （work为延续性动词）
4. after, before, as soon as, not…until after表示主句的动作发生在从句动作之后； before表示主句的动作发生在从句动作之前； as soon as表示 “一……就……”； not…until表示“直到……才”。 You should make a good plan before you do anything important. I’ll call you as soon as I come back. She didn’t go to bed until her mother came home.
生在从句之前或之后。包括：after
（ 在 …… 之 后 ） ， before （ 在 ……之前）。大家好
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时间状语从句的分类
After we heard the news, we were all excited. He made a plan before he went to London.
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Bye Bye
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时间状语从句的分类
3. 表示持续。until（直到……才/为止)
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时间状语从句的分类
1. He waited for his father until it was
twelve o’clock.
2. He didn’t go to bed until he finished
his homework.
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易错点1
Once you see her, you will never forget her.
从现
主将
Please call me as soon as you arrive America.
主祈
从现
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易错点3 when/while/as的区别
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易错点3 when/while/as的区别
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12
【典例1】I didn’t believe he could drive _____ he told me.
A. once
B. while C. since D. until
解析
考查时间状语从句连接词。句意：直到他告诉， 我才相信他会开车。not…until直到……才，固定 搭配，答案选D。
初中英语仁爱版八年级下册
Unit6 Topic2
语法专项课件 （时间状语从句）
时间状语从句的分类
1. 表示同时性，即主从句的谓语动作同时发
生或几乎同时发生。包括：when（当……
时 候 ） ， while （ 当 …… 时 候 ） ， as
（ 当 …… 时 候 ） ， as soon as （ 一 ……